xref: /freebsd/sys/netinet6/icmp6.c (revision 4399e055ea610cdefa1470ad1ee614dd81ba5e56)
1caf43b02SWarner Losh /*-
251369649SPedro F. Giffuni  * SPDX-License-Identifier: BSD-3-Clause
351369649SPedro F. Giffuni  *
482cd038dSYoshinobu Inoue  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
582cd038dSYoshinobu Inoue  * All rights reserved.
682cd038dSYoshinobu Inoue  *
782cd038dSYoshinobu Inoue  * Redistribution and use in source and binary forms, with or without
882cd038dSYoshinobu Inoue  * modification, are permitted provided that the following conditions
982cd038dSYoshinobu Inoue  * are met:
1082cd038dSYoshinobu Inoue  * 1. Redistributions of source code must retain the above copyright
1182cd038dSYoshinobu Inoue  *    notice, this list of conditions and the following disclaimer.
1282cd038dSYoshinobu Inoue  * 2. Redistributions in binary form must reproduce the above copyright
1382cd038dSYoshinobu Inoue  *    notice, this list of conditions and the following disclaimer in the
1482cd038dSYoshinobu Inoue  *    documentation and/or other materials provided with the distribution.
1582cd038dSYoshinobu Inoue  * 3. Neither the name of the project nor the names of its contributors
1682cd038dSYoshinobu Inoue  *    may be used to endorse or promote products derived from this software
1782cd038dSYoshinobu Inoue  *    without specific prior written permission.
1882cd038dSYoshinobu Inoue  *
1982cd038dSYoshinobu Inoue  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
2082cd038dSYoshinobu Inoue  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
2182cd038dSYoshinobu Inoue  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
2282cd038dSYoshinobu Inoue  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
2382cd038dSYoshinobu Inoue  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
2482cd038dSYoshinobu Inoue  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
2582cd038dSYoshinobu Inoue  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2682cd038dSYoshinobu Inoue  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
2782cd038dSYoshinobu Inoue  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
2882cd038dSYoshinobu Inoue  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
2982cd038dSYoshinobu Inoue  * SUCH DAMAGE.
30b48287a3SDavid E. O'Brien  *
31b48287a3SDavid E. O'Brien  *	$KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $
3282cd038dSYoshinobu Inoue  */
3382cd038dSYoshinobu Inoue 
34caf43b02SWarner Losh /*-
3582cd038dSYoshinobu Inoue  * Copyright (c) 1982, 1986, 1988, 1993
3682cd038dSYoshinobu Inoue  *	The Regents of the University of California.  All rights reserved.
3782cd038dSYoshinobu Inoue  *
3882cd038dSYoshinobu Inoue  * Redistribution and use in source and binary forms, with or without
3982cd038dSYoshinobu Inoue  * modification, are permitted provided that the following conditions
4082cd038dSYoshinobu Inoue  * are met:
4182cd038dSYoshinobu Inoue  * 1. Redistributions of source code must retain the above copyright
4282cd038dSYoshinobu Inoue  *    notice, this list of conditions and the following disclaimer.
4382cd038dSYoshinobu Inoue  * 2. Redistributions in binary form must reproduce the above copyright
4482cd038dSYoshinobu Inoue  *    notice, this list of conditions and the following disclaimer in the
4582cd038dSYoshinobu Inoue  *    documentation and/or other materials provided with the distribution.
46fbbd9655SWarner Losh  * 3. Neither the name of the University nor the names of its contributors
4782cd038dSYoshinobu Inoue  *    may be used to endorse or promote products derived from this software
4882cd038dSYoshinobu Inoue  *    without specific prior written permission.
4982cd038dSYoshinobu Inoue  *
5082cd038dSYoshinobu Inoue  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
5182cd038dSYoshinobu Inoue  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
5282cd038dSYoshinobu Inoue  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
5382cd038dSYoshinobu Inoue  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
5482cd038dSYoshinobu Inoue  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
5582cd038dSYoshinobu Inoue  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
5682cd038dSYoshinobu Inoue  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
5782cd038dSYoshinobu Inoue  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
5882cd038dSYoshinobu Inoue  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
5982cd038dSYoshinobu Inoue  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
6082cd038dSYoshinobu Inoue  * SUCH DAMAGE.
6182cd038dSYoshinobu Inoue  */
6282cd038dSYoshinobu Inoue 
63b48287a3SDavid E. O'Brien #include <sys/cdefs.h>
64f0cace5dSRobert Watson #define	MBUF_PRIVATE	/* XXXRW: Optimisation tries to avoid M_EXT mbufs */
65f0cace5dSRobert Watson 
66686cdd19SJun-ichiro itojun Hagino #include "opt_inet.h"
67686cdd19SJun-ichiro itojun Hagino #include "opt_inet6.h"
6882cd038dSYoshinobu Inoue 
6982cd038dSYoshinobu Inoue #include <sys/param.h>
70960ed29cSSeigo Tanimura #include <sys/domain.h>
7176ca6f88SJamie Gritton #include <sys/jail.h>
72960ed29cSSeigo Tanimura #include <sys/kernel.h>
73960ed29cSSeigo Tanimura #include <sys/lock.h>
7433841545SHajimu UMEMOTO #include <sys/malloc.h>
7582cd038dSYoshinobu Inoue #include <sys/mbuf.h>
76530c0060SRobert Watson #include <sys/proc.h>
7782cd038dSYoshinobu Inoue #include <sys/protosw.h>
78960ed29cSSeigo Tanimura #include <sys/signalvar.h>
7982cd038dSYoshinobu Inoue #include <sys/socket.h>
8082cd038dSYoshinobu Inoue #include <sys/socketvar.h>
81960ed29cSSeigo Tanimura #include <sys/sx.h>
8282cd038dSYoshinobu Inoue #include <sys/syslog.h>
83960ed29cSSeigo Tanimura #include <sys/systm.h>
84960ed29cSSeigo Tanimura #include <sys/time.h>
8582cd038dSYoshinobu Inoue 
8682cd038dSYoshinobu Inoue #include <net/if.h>
8776039bc8SGleb Smirnoff #include <net/if_var.h>
8882cd038dSYoshinobu Inoue #include <net/if_dl.h>
896e6b3f7cSQing Li #include <net/if_llatbl.h>
903d0d5b21SJustin Hibbits #include <net/if_private.h>
9182cd038dSYoshinobu Inoue #include <net/if_types.h>
92960ed29cSSeigo Tanimura #include <net/route.h>
93da187ddbSAlexander V. Chernikov #include <net/route/route_ctl.h>
949ac7c6cfSAlexander V. Chernikov #include <net/route/nhop.h>
954b79449eSBjoern A. Zeeb #include <net/vnet.h>
9682cd038dSYoshinobu Inoue 
9782cd038dSYoshinobu Inoue #include <netinet/in.h>
98960ed29cSSeigo Tanimura #include <netinet/in_pcb.h>
9982cd038dSYoshinobu Inoue #include <netinet/in_var.h>
100686cdd19SJun-ichiro itojun Hagino #include <netinet/ip6.h>
101686cdd19SJun-ichiro itojun Hagino #include <netinet/icmp6.h>
10297d8d152SAndre Oppermann #include <netinet/tcp_var.h>
1034b79449eSBjoern A. Zeeb 
1049977be4aSAlexander V. Chernikov #include <netinet6/in6_fib.h>
10582cd038dSYoshinobu Inoue #include <netinet6/in6_ifattach.h>
106960ed29cSSeigo Tanimura #include <netinet6/in6_pcb.h>
107960ed29cSSeigo Tanimura #include <netinet6/ip6_var.h>
108a1f7e5f8SHajimu UMEMOTO #include <netinet6/scope6_var.h>
109960ed29cSSeigo Tanimura #include <netinet6/mld6_var.h>
110960ed29cSSeigo Tanimura #include <netinet6/nd6.h>
1111db8d1f8SAna Kukec #include <netinet6/send.h>
11282cd038dSYoshinobu Inoue 
11343d39ca7SGleb Smirnoff extern ip6proto_ctlinput_t	*ip6_ctlprotox[];
11497021c24SMarko Zec 
115a786f679SAndrey V. Elsukov VNET_PCPUSTAT_DEFINE(struct icmp6stat, icmp6stat);
116a786f679SAndrey V. Elsukov VNET_PCPUSTAT_SYSINIT(icmp6stat);
1174f96be33SGleb Smirnoff SYSCTL_VNET_PCPUSTAT(_net_inet6_icmp6, ICMPV6CTL_STATS, stats,
1184f96be33SGleb Smirnoff     struct icmp6stat, icmp6stat,
1194f96be33SGleb Smirnoff     "ICMPv6 statistics (struct icmp6stat, netinet/icmp6.h)");
120a786f679SAndrey V. Elsukov 
121a786f679SAndrey V. Elsukov #ifdef VIMAGE
122a786f679SAndrey V. Elsukov VNET_PCPUSTAT_SYSUNINIT(icmp6stat);
123a786f679SAndrey V. Elsukov #endif /* VIMAGE */
12482cea7e6SBjoern A. Zeeb 
1254f96be33SGleb Smirnoff VNET_DEFINE_STATIC(int, icmp6_rediraccept) = 1;
1264f96be33SGleb Smirnoff #define	V_icmp6_rediraccept	VNET(icmp6_rediraccept)
1274f96be33SGleb Smirnoff SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRACCEPT, rediraccept,
1284f96be33SGleb Smirnoff     CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6_rediraccept), 0,
1294f96be33SGleb Smirnoff     "Accept ICMPv6 redirect messages");
1304f96be33SGleb Smirnoff 
1314f96be33SGleb Smirnoff VNET_DEFINE_STATIC(int, icmp6_redirtimeout) = 10 * 60;	/* 10 minutes */
1324f96be33SGleb Smirnoff #define	V_icmp6_redirtimeout	VNET(icmp6_redirtimeout)
1334f96be33SGleb Smirnoff SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_REDIRTIMEOUT, redirtimeout,
1344f96be33SGleb Smirnoff     CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6_redirtimeout), 0,
1354f96be33SGleb Smirnoff     "Delay in seconds before expiring redirect route");
1364f96be33SGleb Smirnoff 
1374f96be33SGleb Smirnoff VNET_DEFINE_STATIC(int, icmp6_nodeinfo) = 0;
1384f96be33SGleb Smirnoff #define	V_icmp6_nodeinfo	VNET(icmp6_nodeinfo)
1394f96be33SGleb Smirnoff SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_NODEINFO, nodeinfo,
1404f96be33SGleb Smirnoff     CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6_nodeinfo), 0,
1414f96be33SGleb Smirnoff     "Mask of enabled RFC4620 node information query types");
1424f96be33SGleb Smirnoff 
143eddfbb76SRobert Watson VNET_DECLARE(struct inpcbinfo, ripcbinfo);
1444f96be33SGleb Smirnoff #define	V_ripcbinfo		VNET(ripcbinfo)
1454f96be33SGleb Smirnoff 
14649dc650cSAndrey V. Elsukov static void icmp6_errcount(int, int);
1479233d8f3SDavid E. O'Brien static int icmp6_rip6_input(struct mbuf **, int);
1480700d2c3SBjoern A. Zeeb static void icmp6_reflect(struct mbuf *, size_t);
1496f56329aSXin LI static const char *icmp6_redirect_diag(struct in6_addr *,
1506f56329aSXin LI 	struct in6_addr *, struct in6_addr *);
1517460ef5dSHiroki Sato static struct mbuf *ni6_input(struct mbuf *, int, struct prison *);
1529233d8f3SDavid E. O'Brien static struct mbuf *ni6_nametodns(const char *, int, int);
1539233d8f3SDavid E. O'Brien static int ni6_dnsmatch(const char *, int, const char *, int);
1546f56329aSXin LI static int ni6_addrs(struct icmp6_nodeinfo *, struct mbuf *,
1556f56329aSXin LI 			  struct ifnet **, struct in6_addr *);
1566f56329aSXin LI static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
1576f56329aSXin LI 				struct ifnet *, int);
158fcb3f813SGleb Smirnoff static int icmp6_notify_error(struct mbuf **, int, int);
15982cd038dSYoshinobu Inoue 
160315e3e38SRobert Watson /*
161315e3e38SRobert Watson  * Kernel module interface for updating icmp6stat.  The argument is an index
162315e3e38SRobert Watson  * into icmp6stat treated as an array of u_quad_t.  While this encodes the
163315e3e38SRobert Watson  * general layout of icmp6stat into the caller, it doesn't encode its
164315e3e38SRobert Watson  * location, so that future changes to add, for example, per-CPU stats
165315e3e38SRobert Watson  * support won't cause binary compatibility problems for kernel modules.
166315e3e38SRobert Watson  */
167315e3e38SRobert Watson void
168315e3e38SRobert Watson kmod_icmp6stat_inc(int statnum)
169315e3e38SRobert Watson {
170315e3e38SRobert Watson 
171a786f679SAndrey V. Elsukov 	counter_u64_add(VNET(icmp6stat)[statnum], 1);
172315e3e38SRobert Watson }
173315e3e38SRobert Watson 
174686cdd19SJun-ichiro itojun Hagino static void
17549dc650cSAndrey V. Elsukov icmp6_errcount(int type, int code)
176686cdd19SJun-ichiro itojun Hagino {
177686cdd19SJun-ichiro itojun Hagino 	switch (type) {
178686cdd19SJun-ichiro itojun Hagino 	case ICMP6_DST_UNREACH:
179686cdd19SJun-ichiro itojun Hagino 		switch (code) {
180686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_NOROUTE:
18149dc650cSAndrey V. Elsukov 			ICMP6STAT_INC(icp6s_odst_unreach_noroute);
182686cdd19SJun-ichiro itojun Hagino 			return;
183686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_ADMIN:
18449dc650cSAndrey V. Elsukov 			ICMP6STAT_INC(icp6s_odst_unreach_admin);
185686cdd19SJun-ichiro itojun Hagino 			return;
186686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_BEYONDSCOPE:
18749dc650cSAndrey V. Elsukov 			ICMP6STAT_INC(icp6s_odst_unreach_beyondscope);
188686cdd19SJun-ichiro itojun Hagino 			return;
189686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_ADDR:
19049dc650cSAndrey V. Elsukov 			ICMP6STAT_INC(icp6s_odst_unreach_addr);
191686cdd19SJun-ichiro itojun Hagino 			return;
192686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_NOPORT:
19349dc650cSAndrey V. Elsukov 			ICMP6STAT_INC(icp6s_odst_unreach_noport);
194686cdd19SJun-ichiro itojun Hagino 			return;
195686cdd19SJun-ichiro itojun Hagino 		}
196686cdd19SJun-ichiro itojun Hagino 		break;
197686cdd19SJun-ichiro itojun Hagino 	case ICMP6_PACKET_TOO_BIG:
19849dc650cSAndrey V. Elsukov 		ICMP6STAT_INC(icp6s_opacket_too_big);
199686cdd19SJun-ichiro itojun Hagino 		return;
200686cdd19SJun-ichiro itojun Hagino 	case ICMP6_TIME_EXCEEDED:
201686cdd19SJun-ichiro itojun Hagino 		switch (code) {
202686cdd19SJun-ichiro itojun Hagino 		case ICMP6_TIME_EXCEED_TRANSIT:
20349dc650cSAndrey V. Elsukov 			ICMP6STAT_INC(icp6s_otime_exceed_transit);
204686cdd19SJun-ichiro itojun Hagino 			return;
205686cdd19SJun-ichiro itojun Hagino 		case ICMP6_TIME_EXCEED_REASSEMBLY:
20649dc650cSAndrey V. Elsukov 			ICMP6STAT_INC(icp6s_otime_exceed_reassembly);
207686cdd19SJun-ichiro itojun Hagino 			return;
208686cdd19SJun-ichiro itojun Hagino 		}
209686cdd19SJun-ichiro itojun Hagino 		break;
210686cdd19SJun-ichiro itojun Hagino 	case ICMP6_PARAM_PROB:
211686cdd19SJun-ichiro itojun Hagino 		switch (code) {
212686cdd19SJun-ichiro itojun Hagino 		case ICMP6_PARAMPROB_HEADER:
21349dc650cSAndrey V. Elsukov 			ICMP6STAT_INC(icp6s_oparamprob_header);
214686cdd19SJun-ichiro itojun Hagino 			return;
215686cdd19SJun-ichiro itojun Hagino 		case ICMP6_PARAMPROB_NEXTHEADER:
21649dc650cSAndrey V. Elsukov 			ICMP6STAT_INC(icp6s_oparamprob_nextheader);
217686cdd19SJun-ichiro itojun Hagino 			return;
218686cdd19SJun-ichiro itojun Hagino 		case ICMP6_PARAMPROB_OPTION:
21949dc650cSAndrey V. Elsukov 			ICMP6STAT_INC(icp6s_oparamprob_option);
220686cdd19SJun-ichiro itojun Hagino 			return;
221686cdd19SJun-ichiro itojun Hagino 		}
222686cdd19SJun-ichiro itojun Hagino 		break;
223686cdd19SJun-ichiro itojun Hagino 	case ND_REDIRECT:
22449dc650cSAndrey V. Elsukov 		ICMP6STAT_INC(icp6s_oredirect);
225686cdd19SJun-ichiro itojun Hagino 		return;
226686cdd19SJun-ichiro itojun Hagino 	}
22749dc650cSAndrey V. Elsukov 	ICMP6STAT_INC(icp6s_ounknown);
228686cdd19SJun-ichiro itojun Hagino }
229686cdd19SJun-ichiro itojun Hagino 
23082cd038dSYoshinobu Inoue /*
231a1f7e5f8SHajimu UMEMOTO  * A wrapper function for icmp6_error() necessary when the erroneous packet
232a1f7e5f8SHajimu UMEMOTO  * may not contain enough scope zone information.
233a1f7e5f8SHajimu UMEMOTO  */
234a1f7e5f8SHajimu UMEMOTO void
2351272577eSXin LI icmp6_error2(struct mbuf *m, int type, int code, int param,
2361272577eSXin LI     struct ifnet *ifp)
237a1f7e5f8SHajimu UMEMOTO {
238a1f7e5f8SHajimu UMEMOTO 	struct ip6_hdr *ip6;
239a1f7e5f8SHajimu UMEMOTO 
240a1f7e5f8SHajimu UMEMOTO 	if (ifp == NULL)
241a1f7e5f8SHajimu UMEMOTO 		return;
242a1f7e5f8SHajimu UMEMOTO 
243a1f7e5f8SHajimu UMEMOTO 	if (m->m_len < sizeof(struct ip6_hdr)) {
244a1f7e5f8SHajimu UMEMOTO 		m = m_pullup(m, sizeof(struct ip6_hdr));
245a61b5cfbSBjoern A. Zeeb 		if (m == NULL) {
246a61b5cfbSBjoern A. Zeeb 			IP6STAT_INC(ip6s_exthdrtoolong);
247a1f7e5f8SHajimu UMEMOTO 			return;
248a1f7e5f8SHajimu UMEMOTO 		}
249a61b5cfbSBjoern A. Zeeb 	}
250a1f7e5f8SHajimu UMEMOTO 	ip6 = mtod(m, struct ip6_hdr *);
251a1f7e5f8SHajimu UMEMOTO 
252a1f7e5f8SHajimu UMEMOTO 	if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0)
253a1f7e5f8SHajimu UMEMOTO 		return;
254a1f7e5f8SHajimu UMEMOTO 	if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
255a1f7e5f8SHajimu UMEMOTO 		return;
256a1f7e5f8SHajimu UMEMOTO 
257a1f7e5f8SHajimu UMEMOTO 	icmp6_error(m, type, code, param);
258a1f7e5f8SHajimu UMEMOTO }
259a1f7e5f8SHajimu UMEMOTO 
260a1f7e5f8SHajimu UMEMOTO /*
26182cd038dSYoshinobu Inoue  * Generate an error packet of type error in response to bad IP6 packet.
26282cd038dSYoshinobu Inoue  */
26382cd038dSYoshinobu Inoue void
2641272577eSXin LI icmp6_error(struct mbuf *m, int type, int code, int param)
26582cd038dSYoshinobu Inoue {
26682cd038dSYoshinobu Inoue 	struct ip6_hdr *oip6, *nip6;
26782cd038dSYoshinobu Inoue 	struct icmp6_hdr *icmp6;
268605284b8SAlexander V. Chernikov 	struct epoch_tracker et;
269686cdd19SJun-ichiro itojun Hagino 	u_int preplen;
27082cd038dSYoshinobu Inoue 	int off;
271686cdd19SJun-ichiro itojun Hagino 	int nxt;
27282cd038dSYoshinobu Inoue 
273e27b0c87SRobert Watson 	ICMP6STAT_INC(icp6s_error);
27482cd038dSYoshinobu Inoue 
275686cdd19SJun-ichiro itojun Hagino 	/* count per-type-code statistics */
27649dc650cSAndrey V. Elsukov 	icmp6_errcount(type, code);
27782cd038dSYoshinobu Inoue 
278686cdd19SJun-ichiro itojun Hagino #ifdef M_DECRYPTED	/*not openbsd*/
279686cdd19SJun-ichiro itojun Hagino 	if (m->m_flags & M_DECRYPTED) {
280e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_canterror);
281686cdd19SJun-ichiro itojun Hagino 		goto freeit;
282686cdd19SJun-ichiro itojun Hagino 	}
283686cdd19SJun-ichiro itojun Hagino #endif
284686cdd19SJun-ichiro itojun Hagino 
285686cdd19SJun-ichiro itojun Hagino 	if (m->m_len < sizeof(struct ip6_hdr)) {
286686cdd19SJun-ichiro itojun Hagino 		m = m_pullup(m, sizeof(struct ip6_hdr));
287a61b5cfbSBjoern A. Zeeb 		if (m == NULL) {
288a61b5cfbSBjoern A. Zeeb 			IP6STAT_INC(ip6s_exthdrtoolong);
289686cdd19SJun-ichiro itojun Hagino 			return;
290686cdd19SJun-ichiro itojun Hagino 		}
291a61b5cfbSBjoern A. Zeeb 	}
29282cd038dSYoshinobu Inoue 	oip6 = mtod(m, struct ip6_hdr *);
29382cd038dSYoshinobu Inoue 
29482cd038dSYoshinobu Inoue 	/*
295f95d4633SHajimu UMEMOTO 	 * If the destination address of the erroneous packet is a multicast
296f95d4633SHajimu UMEMOTO 	 * address, or the packet was sent using link-layer multicast,
297f95d4633SHajimu UMEMOTO 	 * we should basically suppress sending an error (RFC 2463, Section
298f95d4633SHajimu UMEMOTO 	 * 2.4).
299f95d4633SHajimu UMEMOTO 	 * We have two exceptions (the item e.2 in that section):
3001767c520SBjoern A. Zeeb 	 * - the Packet Too Big message can be sent for path MTU discovery.
301f95d4633SHajimu UMEMOTO 	 * - the Parameter Problem Message that can be allowed an icmp6 error
302f95d4633SHajimu UMEMOTO 	 *   in the option type field.  This check has been done in
303f95d4633SHajimu UMEMOTO 	 *   ip6_unknown_opt(), so we can just check the type and code.
30482cd038dSYoshinobu Inoue 	 */
30582cd038dSYoshinobu Inoue 	if ((m->m_flags & (M_BCAST|M_MCAST) ||
30682cd038dSYoshinobu Inoue 	     IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
30782cd038dSYoshinobu Inoue 	    (type != ICMP6_PACKET_TOO_BIG &&
30882cd038dSYoshinobu Inoue 	     (type != ICMP6_PARAM_PROB ||
30982cd038dSYoshinobu Inoue 	      code != ICMP6_PARAMPROB_OPTION)))
31082cd038dSYoshinobu Inoue 		goto freeit;
31182cd038dSYoshinobu Inoue 
312f95d4633SHajimu UMEMOTO 	/*
313f95d4633SHajimu UMEMOTO 	 * RFC 2463, 2.4 (e.5): source address check.
314f95d4633SHajimu UMEMOTO 	 * XXX: the case of anycast source?
315f95d4633SHajimu UMEMOTO 	 */
31682cd038dSYoshinobu Inoue 	if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
31782cd038dSYoshinobu Inoue 	    IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
31882cd038dSYoshinobu Inoue 		goto freeit;
31982cd038dSYoshinobu Inoue 
32082cd038dSYoshinobu Inoue 	/*
321686cdd19SJun-ichiro itojun Hagino 	 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
322686cdd19SJun-ichiro itojun Hagino 	 * don't do it.
32382cd038dSYoshinobu Inoue 	 */
324686cdd19SJun-ichiro itojun Hagino 	nxt = -1;
325686cdd19SJun-ichiro itojun Hagino 	off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
326686cdd19SJun-ichiro itojun Hagino 	if (off >= 0 && nxt == IPPROTO_ICMPV6) {
32782cd038dSYoshinobu Inoue 		struct icmp6_hdr *icp;
32882cd038dSYoshinobu Inoue 
329a4adf6ccSBjoern A. Zeeb 		if (m->m_len < off + sizeof(struct icmp6_hdr)) {
330a61b5cfbSBjoern A. Zeeb 			m = m_pullup(m, off + sizeof(struct icmp6_hdr));
331a61b5cfbSBjoern A. Zeeb 			if (m == NULL) {
332a61b5cfbSBjoern A. Zeeb 				IP6STAT_INC(ip6s_exthdrtoolong);
333686cdd19SJun-ichiro itojun Hagino 				return;
334686cdd19SJun-ichiro itojun Hagino 			}
335a4adf6ccSBjoern A. Zeeb 		}
336a61b5cfbSBjoern A. Zeeb 		oip6 = mtod(m, struct ip6_hdr *);
337a61b5cfbSBjoern A. Zeeb 		icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
338a61b5cfbSBjoern A. Zeeb 
339686cdd19SJun-ichiro itojun Hagino 		if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
340686cdd19SJun-ichiro itojun Hagino 		    icp->icmp6_type == ND_REDIRECT) {
34182cd038dSYoshinobu Inoue 			/*
34282cd038dSYoshinobu Inoue 			 * ICMPv6 error
34382cd038dSYoshinobu Inoue 			 * Special case: for redirect (which is
34482cd038dSYoshinobu Inoue 			 * informational) we must not send icmp6 error.
34582cd038dSYoshinobu Inoue 			 */
346e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_canterror);
34782cd038dSYoshinobu Inoue 			goto freeit;
34882cd038dSYoshinobu Inoue 		} else {
349686cdd19SJun-ichiro itojun Hagino 			/* ICMPv6 informational - send the error */
35082cd038dSYoshinobu Inoue 		}
351686cdd19SJun-ichiro itojun Hagino 	} else {
352686cdd19SJun-ichiro itojun Hagino 		/* non-ICMPv6 - send the error */
35382cd038dSYoshinobu Inoue 	}
35482cd038dSYoshinobu Inoue 
35582cd038dSYoshinobu Inoue 	/* Finally, do rate limitation check. */
356c6c96aabSGleb Smirnoff 	if (icmp6_ratelimit(&oip6->ip6_src, type, code))
35782cd038dSYoshinobu Inoue 		goto freeit;
35882cd038dSYoshinobu Inoue 
35982cd038dSYoshinobu Inoue 	/*
36082cd038dSYoshinobu Inoue 	 * OK, ICMP6 can be generated.
36182cd038dSYoshinobu Inoue 	 */
36282cd038dSYoshinobu Inoue 
36382cd038dSYoshinobu Inoue 	if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
36482cd038dSYoshinobu Inoue 		m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
36582cd038dSYoshinobu Inoue 
366686cdd19SJun-ichiro itojun Hagino 	preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
367eb1b1807SGleb Smirnoff 	M_PREPEND(m, preplen, M_NOWAIT);	/* FIB is also copied over. */
36882cd038dSYoshinobu Inoue 	if (m == NULL) {
36933841545SHajimu UMEMOTO 		nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
37082cd038dSYoshinobu Inoue 		return;
37182cd038dSYoshinobu Inoue 	}
37282cd038dSYoshinobu Inoue 
37382cd038dSYoshinobu Inoue 	nip6 = mtod(m, struct ip6_hdr *);
37482cd038dSYoshinobu Inoue 	nip6->ip6_src  = oip6->ip6_src;
37582cd038dSYoshinobu Inoue 	nip6->ip6_dst  = oip6->ip6_dst;
37682cd038dSYoshinobu Inoue 
3779a4f9608SHajimu UMEMOTO 	in6_clearscope(&oip6->ip6_src);
3789a4f9608SHajimu UMEMOTO 	in6_clearscope(&oip6->ip6_dst);
37982cd038dSYoshinobu Inoue 
38082cd038dSYoshinobu Inoue 	icmp6 = (struct icmp6_hdr *)(nip6 + 1);
38182cd038dSYoshinobu Inoue 	icmp6->icmp6_type = type;
38282cd038dSYoshinobu Inoue 	icmp6->icmp6_code = code;
38382cd038dSYoshinobu Inoue 	icmp6->icmp6_pptr = htonl((u_int32_t)param);
38482cd038dSYoshinobu Inoue 
385e27b0c87SRobert Watson 	ICMP6STAT_INC(icp6s_outhist[type]);
386605284b8SAlexander V. Chernikov 	NET_EPOCH_ENTER(et);
38782cd038dSYoshinobu Inoue 	icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
388605284b8SAlexander V. Chernikov 	NET_EPOCH_EXIT(et);
389686cdd19SJun-ichiro itojun Hagino 
390686cdd19SJun-ichiro itojun Hagino 	return;
391686cdd19SJun-ichiro itojun Hagino 
392686cdd19SJun-ichiro itojun Hagino   freeit:
393686cdd19SJun-ichiro itojun Hagino 	/*
394cd0fdcf7SHajimu UMEMOTO 	 * If we can't tell whether or not we can generate ICMP6, free it.
395686cdd19SJun-ichiro itojun Hagino 	 */
396686cdd19SJun-ichiro itojun Hagino 	m_freem(m);
39782cd038dSYoshinobu Inoue }
39882cd038dSYoshinobu Inoue 
399fcb3f813SGleb Smirnoff int
400fcb3f813SGleb Smirnoff icmp6_errmap(const struct icmp6_hdr *icmp6)
401fcb3f813SGleb Smirnoff {
402fcb3f813SGleb Smirnoff 
403fcb3f813SGleb Smirnoff 	switch (icmp6->icmp6_type) {
404fcb3f813SGleb Smirnoff 	case ICMP6_DST_UNREACH:
405fcb3f813SGleb Smirnoff 		switch (icmp6->icmp6_code) {
406fcb3f813SGleb Smirnoff 		case ICMP6_DST_UNREACH_NOROUTE:
407fcb3f813SGleb Smirnoff 		case ICMP6_DST_UNREACH_ADDR:
408fcb3f813SGleb Smirnoff 			return (EHOSTUNREACH);
409fcb3f813SGleb Smirnoff 		case ICMP6_DST_UNREACH_NOPORT:
410fcb3f813SGleb Smirnoff 		case ICMP6_DST_UNREACH_ADMIN:
411fcb3f813SGleb Smirnoff 			return (ECONNREFUSED);
412fcb3f813SGleb Smirnoff 		case ICMP6_DST_UNREACH_BEYONDSCOPE:
413fcb3f813SGleb Smirnoff 			return (ENOPROTOOPT);
414fcb3f813SGleb Smirnoff 		default:
415fcb3f813SGleb Smirnoff 			return (0);	/* Shouldn't happen. */
416fcb3f813SGleb Smirnoff 		}
417fcb3f813SGleb Smirnoff 	case ICMP6_PACKET_TOO_BIG:
418fcb3f813SGleb Smirnoff 		return (EMSGSIZE);
419fcb3f813SGleb Smirnoff 	case ICMP6_TIME_EXCEEDED:
420fcb3f813SGleb Smirnoff 		switch (icmp6->icmp6_code) {
421fcb3f813SGleb Smirnoff 		case ICMP6_TIME_EXCEED_TRANSIT:
422fcb3f813SGleb Smirnoff 			return (EHOSTUNREACH);
423fcb3f813SGleb Smirnoff 		case ICMP6_TIME_EXCEED_REASSEMBLY:
424fcb3f813SGleb Smirnoff 			return (0);
425fcb3f813SGleb Smirnoff 		default:
426fcb3f813SGleb Smirnoff 			return (0);	/* Shouldn't happen. */
427fcb3f813SGleb Smirnoff 		}
428fcb3f813SGleb Smirnoff 	case ICMP6_PARAM_PROB:
429fcb3f813SGleb Smirnoff 		switch (icmp6->icmp6_code) {
430fcb3f813SGleb Smirnoff 		case ICMP6_PARAMPROB_NEXTHEADER:
431fcb3f813SGleb Smirnoff 			return (ECONNREFUSED);
432fcb3f813SGleb Smirnoff 		case ICMP6_PARAMPROB_HEADER:
433fcb3f813SGleb Smirnoff 		case ICMP6_PARAMPROB_OPTION:
434fcb3f813SGleb Smirnoff 			return (ENOPROTOOPT);
435fcb3f813SGleb Smirnoff 		default:
436fcb3f813SGleb Smirnoff 			return (0);	/* Shouldn't happen. */
437fcb3f813SGleb Smirnoff 		}
438fcb3f813SGleb Smirnoff 	default:
439fcb3f813SGleb Smirnoff 		return (0);
440fcb3f813SGleb Smirnoff 	}
441fcb3f813SGleb Smirnoff }
442fcb3f813SGleb Smirnoff 
44382cd038dSYoshinobu Inoue /*
44482cd038dSYoshinobu Inoue  * Process a received ICMP6 message.
44582cd038dSYoshinobu Inoue  */
44682cd038dSYoshinobu Inoue int
4471272577eSXin LI icmp6_input(struct mbuf **mp, int *offp, int proto)
44882cd038dSYoshinobu Inoue {
449503f4e47SBjoern A. Zeeb 	struct mbuf *m, *n;
45029dc7bc6SBruce M Simpson 	struct ifnet *ifp;
45182cd038dSYoshinobu Inoue 	struct ip6_hdr *ip6, *nip6;
45282cd038dSYoshinobu Inoue 	struct icmp6_hdr *icmp6, *nicmp6;
4531d54aa3bSBjoern A. Zeeb 	char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
454503f4e47SBjoern A. Zeeb 	int code, error, icmp6len, ip6len, noff, off, sum;
45582cd038dSYoshinobu Inoue 
456a37a5246SAlexander V. Chernikov 	NET_EPOCH_ASSERT();
457a37a5246SAlexander V. Chernikov 
458503f4e47SBjoern A. Zeeb 	m = *mp;
459503f4e47SBjoern A. Zeeb 	off = *offp;
46029dc7bc6SBruce M Simpson 
461a4adf6ccSBjoern A. Zeeb 	if (m->m_len < off + sizeof(struct icmp6_hdr)) {
462a61b5cfbSBjoern A. Zeeb 		m = m_pullup(m, off + sizeof(struct icmp6_hdr));
463a61b5cfbSBjoern A. Zeeb 		if (m == NULL) {
464a61b5cfbSBjoern A. Zeeb 			IP6STAT_INC(ip6s_exthdrtoolong);
465a61b5cfbSBjoern A. Zeeb 			*mp = m;
466a61b5cfbSBjoern A. Zeeb 			return (IPPROTO_DONE);
467a61b5cfbSBjoern A. Zeeb 		}
468a4adf6ccSBjoern A. Zeeb 	}
46982cd038dSYoshinobu Inoue 
47082cd038dSYoshinobu Inoue 	/*
47182cd038dSYoshinobu Inoue 	 * Locate icmp6 structure in mbuf, and check
47282cd038dSYoshinobu Inoue 	 * that not corrupted and of at least minimum length
47382cd038dSYoshinobu Inoue 	 */
47482cd038dSYoshinobu Inoue 
475503f4e47SBjoern A. Zeeb 	icmp6len = m->m_pkthdr.len - off;
47682cd038dSYoshinobu Inoue 	if (icmp6len < sizeof(struct icmp6_hdr)) {
477e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_tooshort);
47882cd038dSYoshinobu Inoue 		goto freeit;
47982cd038dSYoshinobu Inoue 	}
48082cd038dSYoshinobu Inoue 
481503f4e47SBjoern A. Zeeb 	ip6 = mtod(m, struct ip6_hdr *);
482503f4e47SBjoern A. Zeeb 	ifp = m->m_pkthdr.rcvif;
48382cd038dSYoshinobu Inoue 	/*
48433cde130SBruce M Simpson 	 * Check multicast group membership.
48533cde130SBruce M Simpson 	 * Note: SSM filters are not applied for ICMPv6 traffic.
48633cde130SBruce M Simpson 	 */
48733cde130SBruce M Simpson 	if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
48833cde130SBruce M Simpson 		struct in6_multi	*inm;
48933cde130SBruce M Simpson 
49033cde130SBruce M Simpson 		inm = in6m_lookup(ifp, &ip6->ip6_dst);
49133cde130SBruce M Simpson 		if (inm == NULL) {
49233cde130SBruce M Simpson 			IP6STAT_INC(ip6s_notmember);
49333cde130SBruce M Simpson 			in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
49433cde130SBruce M Simpson 			goto freeit;
49533cde130SBruce M Simpson 		}
49633cde130SBruce M Simpson 	}
49733cde130SBruce M Simpson 
498503f4e47SBjoern A. Zeeb 	/* Calculate the checksum. */
49982cd038dSYoshinobu Inoue 	icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
50082cd038dSYoshinobu Inoue 	code = icmp6->icmp6_code;
50182cd038dSYoshinobu Inoue 	if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
50233841545SHajimu UMEMOTO 		nd6log((LOG_ERR,
50382cd038dSYoshinobu Inoue 		    "ICMP6 checksum error(%d|%x) %s\n",
5041d54aa3bSBjoern A. Zeeb 		    icmp6->icmp6_type, sum,
5051d54aa3bSBjoern A. Zeeb 		    ip6_sprintf(ip6bufs, &ip6->ip6_src)));
506e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_checksum);
50782cd038dSYoshinobu Inoue 		goto freeit;
50882cd038dSYoshinobu Inoue 	}
50982cd038dSYoshinobu Inoue 
510e27b0c87SRobert Watson 	ICMP6STAT_INC(icp6s_inhist[icmp6->icmp6_type]);
51129dc7bc6SBruce M Simpson 	icmp6_ifstat_inc(ifp, ifs6_in_msg);
51282cd038dSYoshinobu Inoue 	if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
51329dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_error);
51482cd038dSYoshinobu Inoue 
515503f4e47SBjoern A. Zeeb 	ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen);
51682cd038dSYoshinobu Inoue 	switch (icmp6->icmp6_type) {
51782cd038dSYoshinobu Inoue 	case ICMP6_DST_UNREACH:
51829dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_dstunreach);
51982cd038dSYoshinobu Inoue 		switch (code) {
52082cd038dSYoshinobu Inoue 		case ICMP6_DST_UNREACH_ADMIN:
52129dc7bc6SBruce M Simpson 			icmp6_ifstat_inc(ifp, ifs6_in_adminprohib);
522fcb3f813SGleb Smirnoff 		case ICMP6_DST_UNREACH_NOROUTE:
523fcb3f813SGleb Smirnoff 		case ICMP6_DST_UNREACH_ADDR:
524686cdd19SJun-ichiro itojun Hagino 		case ICMP6_DST_UNREACH_BEYONDSCOPE:
52582cd038dSYoshinobu Inoue 		case ICMP6_DST_UNREACH_NOPORT:
526fcb3f813SGleb Smirnoff 			goto deliver;
52782cd038dSYoshinobu Inoue 		default:
52882cd038dSYoshinobu Inoue 			goto badcode;
52982cd038dSYoshinobu Inoue 		}
53082cd038dSYoshinobu Inoue 	case ICMP6_PACKET_TOO_BIG:
53129dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_pkttoobig);
532686cdd19SJun-ichiro itojun Hagino 		/*
533fcb3f813SGleb Smirnoff 		 * Validation is made in icmp6_mtudisc_update.
534686cdd19SJun-ichiro itojun Hagino 		 * Updating the path MTU will be done after examining
535686cdd19SJun-ichiro itojun Hagino 		 * intermediate extension headers.
536686cdd19SJun-ichiro itojun Hagino 		 */
53782cd038dSYoshinobu Inoue 		goto deliver;
53882cd038dSYoshinobu Inoue 	case ICMP6_TIME_EXCEEDED:
53929dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_timeexceed);
54082cd038dSYoshinobu Inoue 		switch (code) {
54182cd038dSYoshinobu Inoue 		case ICMP6_TIME_EXCEED_TRANSIT:
54282cd038dSYoshinobu Inoue 		case ICMP6_TIME_EXCEED_REASSEMBLY:
543fcb3f813SGleb Smirnoff 			goto deliver;
54482cd038dSYoshinobu Inoue 		default:
54582cd038dSYoshinobu Inoue 			goto badcode;
54682cd038dSYoshinobu Inoue 		}
54782cd038dSYoshinobu Inoue 	case ICMP6_PARAM_PROB:
54829dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_paramprob);
54982cd038dSYoshinobu Inoue 		switch (code) {
55082cd038dSYoshinobu Inoue 		case ICMP6_PARAMPROB_NEXTHEADER:
55182cd038dSYoshinobu Inoue 		case ICMP6_PARAMPROB_HEADER:
55282cd038dSYoshinobu Inoue 		case ICMP6_PARAMPROB_OPTION:
553fcb3f813SGleb Smirnoff 			goto deliver;
55482cd038dSYoshinobu Inoue 		default:
55582cd038dSYoshinobu Inoue 			goto badcode;
55682cd038dSYoshinobu Inoue 		}
55782cd038dSYoshinobu Inoue 	case ICMP6_ECHO_REQUEST:
55829dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_echo);
55982cd038dSYoshinobu Inoue 		if (code != 0)
56082cd038dSYoshinobu Inoue 			goto badcode;
56132aeee8cSGleb Smirnoff 		if (icmp6_ratelimit(&ip6->ip6_src, ICMP6_ECHO_REPLY, 0))
56232aeee8cSGleb Smirnoff 			break;
563c3bef61eSKevin Lo 		if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) {
56482cd038dSYoshinobu Inoue 			/* Give up remote */
56582cd038dSYoshinobu Inoue 			break;
56682cd038dSYoshinobu Inoue 		}
567f0cace5dSRobert Watson 		if (!M_WRITABLE(n)
568686cdd19SJun-ichiro itojun Hagino 		 || n->m_len < off + sizeof(struct icmp6_hdr)) {
56982cd038dSYoshinobu Inoue 			struct mbuf *n0 = n;
5702268ca47SSam Leffler 			int n0len;
57182cd038dSYoshinobu Inoue 
57210e5acc3SGleb Smirnoff 			CTASSERT(sizeof(*nip6) + sizeof(*nicmp6) <= MHLEN);
5737b07d1beSGleb Smirnoff 			n = m_gethdr(M_NOWAIT, n0->m_type);
57482cd038dSYoshinobu Inoue 			if (n == NULL) {
57582cd038dSYoshinobu Inoue 				/* Give up remote */
57682cd038dSYoshinobu Inoue 				m_freem(n0);
57782cd038dSYoshinobu Inoue 				break;
57882cd038dSYoshinobu Inoue 			}
57910e5acc3SGleb Smirnoff 
58010e5acc3SGleb Smirnoff 			m_move_pkthdr(n, n0);	/* FIB copied. */
58110e5acc3SGleb Smirnoff 			n0len = n0->m_pkthdr.len;	/* save for use below */
58282cd038dSYoshinobu Inoue 			/*
58382cd038dSYoshinobu Inoue 			 * Copy IPv6 and ICMPv6 only.
58482cd038dSYoshinobu Inoue 			 */
58582cd038dSYoshinobu Inoue 			nip6 = mtod(n, struct ip6_hdr *);
58682cd038dSYoshinobu Inoue 			bcopy(ip6, nip6, sizeof(struct ip6_hdr));
58782cd038dSYoshinobu Inoue 			nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
58882cd038dSYoshinobu Inoue 			bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
58982cd038dSYoshinobu Inoue 			noff = sizeof(struct ip6_hdr);
5902268ca47SSam Leffler 			/* new mbuf contains only ipv6+icmpv6 headers */
5912268ca47SSam Leffler 			n->m_len = noff + sizeof(struct icmp6_hdr);
592686cdd19SJun-ichiro itojun Hagino 			/*
593686cdd19SJun-ichiro itojun Hagino 			 * Adjust mbuf.  ip6_plen will be adjusted in
594686cdd19SJun-ichiro itojun Hagino 			 * ip6_output().
595686cdd19SJun-ichiro itojun Hagino 			 */
596686cdd19SJun-ichiro itojun Hagino 			m_adj(n0, off + sizeof(struct icmp6_hdr));
5972268ca47SSam Leffler 			/* recalculate complete packet size */
5982268ca47SSam Leffler 			n->m_pkthdr.len = n0len + (noff - off);
599686cdd19SJun-ichiro itojun Hagino 			n->m_next = n0;
60082cd038dSYoshinobu Inoue 		} else {
601a4adf6ccSBjoern A. Zeeb 			if (n->m_len < off + sizeof(*nicmp6)) {
602a61b5cfbSBjoern A. Zeeb 				n = m_pullup(n, off + sizeof(*nicmp6));
603a61b5cfbSBjoern A. Zeeb 				if (n == NULL) {
604a61b5cfbSBjoern A. Zeeb 					IP6STAT_INC(ip6s_exthdrtoolong);
605a61b5cfbSBjoern A. Zeeb 					break;
606a61b5cfbSBjoern A. Zeeb 				}
607a4adf6ccSBjoern A. Zeeb 			}
608a61b5cfbSBjoern A. Zeeb 			nicmp6 = (struct icmp6_hdr *)(mtod(n, caddr_t) + off);
60982cd038dSYoshinobu Inoue 			noff = off;
61082cd038dSYoshinobu Inoue 		}
611fb043945SJonathan T. Looney 		if (n) {
61282cd038dSYoshinobu Inoue 			nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
61382cd038dSYoshinobu Inoue 			nicmp6->icmp6_code = 0;
614e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_reflect);
615e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_outhist[ICMP6_ECHO_REPLY]);
61682cd038dSYoshinobu Inoue 			icmp6_reflect(n, noff);
61782cd038dSYoshinobu Inoue 		}
61882cd038dSYoshinobu Inoue 		break;
61982cd038dSYoshinobu Inoue 
62082cd038dSYoshinobu Inoue 	case ICMP6_ECHO_REPLY:
62129dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_echoreply);
62282cd038dSYoshinobu Inoue 		if (code != 0)
62382cd038dSYoshinobu Inoue 			goto badcode;
62482cd038dSYoshinobu Inoue 		break;
62582cd038dSYoshinobu Inoue 
62681170631SHajimu UMEMOTO 	case MLD_LISTENER_QUERY:
62781170631SHajimu UMEMOTO 	case MLD_LISTENER_REPORT:
62833cde130SBruce M Simpson 	case MLD_LISTENER_DONE:
62933cde130SBruce M Simpson 	case MLDV2_LISTENER_REPORT:
63033cde130SBruce M Simpson 		/*
63129dc7bc6SBruce M Simpson 		 * Drop MLD traffic which is not link-local, has a hop limit
63229dc7bc6SBruce M Simpson 		 * of greater than 1 hop, or which does not have the
63329dc7bc6SBruce M Simpson 		 * IPv6 HBH Router Alert option.
63429dc7bc6SBruce M Simpson 		 * As IPv6 HBH options are stripped in ip6_input() we must
63529dc7bc6SBruce M Simpson 		 * check an mbuf header flag.
63633cde130SBruce M Simpson 		 * XXX Should we also sanity check that these messages
63733cde130SBruce M Simpson 		 * were directed to a link-local multicast prefix?
63833cde130SBruce M Simpson 		 */
63929dc7bc6SBruce M Simpson 		if ((ip6->ip6_hlim != 1) || (m->m_flags & M_RTALERT_MLD) == 0)
640686cdd19SJun-ichiro itojun Hagino 			goto freeit;
64132af08ecSBjoern A. Zeeb 		if (mld_input(&m, off, icmp6len) != 0) {
642a8fe77d8SBjoern A. Zeeb 			*mp = NULL;
64333cde130SBruce M Simpson 			return (IPPROTO_DONE);
644a8fe77d8SBjoern A. Zeeb 		}
64582cd038dSYoshinobu Inoue 		/* m stays. */
64682cd038dSYoshinobu Inoue 		break;
64782cd038dSYoshinobu Inoue 
64882cd038dSYoshinobu Inoue 	case ICMP6_WRUREQUEST:	/* ICMP6_FQDN_QUERY */
64982cd038dSYoshinobu Inoue 	    {
65082cd038dSYoshinobu Inoue 		enum { WRU, FQDN } mode;
6517460ef5dSHiroki Sato 		struct prison *pr;
65282cd038dSYoshinobu Inoue 
653603724d3SBjoern A. Zeeb 		if (!V_icmp6_nodeinfo)
654686cdd19SJun-ichiro itojun Hagino 			break;
655686cdd19SJun-ichiro itojun Hagino 
65682cd038dSYoshinobu Inoue 		if (icmp6len == sizeof(struct icmp6_hdr) + 4)
65782cd038dSYoshinobu Inoue 			mode = WRU;
658686cdd19SJun-ichiro itojun Hagino 		else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
65982cd038dSYoshinobu Inoue 			mode = FQDN;
66082cd038dSYoshinobu Inoue 		else
66182cd038dSYoshinobu Inoue 			goto badlen;
66282cd038dSYoshinobu Inoue 
6637460ef5dSHiroki Sato 		pr = NULL;
6647460ef5dSHiroki Sato 		sx_slock(&allprison_lock);
6657460ef5dSHiroki Sato 		TAILQ_FOREACH(pr, &allprison, pr_list)
6667460ef5dSHiroki Sato 			if (pr->pr_vnet == ifp->if_vnet)
6677460ef5dSHiroki Sato 				break;
6687460ef5dSHiroki Sato 		sx_sunlock(&allprison_lock);
6697460ef5dSHiroki Sato 		if (pr == NULL)
6707460ef5dSHiroki Sato 			pr = curthread->td_ucred->cr_prison;
67182cd038dSYoshinobu Inoue 		if (mode == FQDN) {
672a4adf6ccSBjoern A. Zeeb 			if (m->m_len < off + sizeof(struct icmp6_nodeinfo)) {
673a4adf6ccSBjoern A. Zeeb 				m = m_pullup(m, off +
674a4adf6ccSBjoern A. Zeeb 				    sizeof(struct icmp6_nodeinfo));
675a61b5cfbSBjoern A. Zeeb 				if (m == NULL) {
676a61b5cfbSBjoern A. Zeeb 					IP6STAT_INC(ip6s_exthdrtoolong);
677a61b5cfbSBjoern A. Zeeb 					*mp = m;
678a61b5cfbSBjoern A. Zeeb 					return (IPPROTO_DONE);
679a61b5cfbSBjoern A. Zeeb 				}
680a4adf6ccSBjoern A. Zeeb 			}
681c3bef61eSKevin Lo 			n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
682686cdd19SJun-ichiro itojun Hagino 			if (n)
6837460ef5dSHiroki Sato 				n = ni6_input(n, off, pr);
684686cdd19SJun-ichiro itojun Hagino 			/* XXX meaningless if n == NULL */
68582cd038dSYoshinobu Inoue 			noff = sizeof(struct ip6_hdr);
68682cd038dSYoshinobu Inoue 		} else {
68782cd038dSYoshinobu Inoue 			u_char *p;
68810e5acc3SGleb Smirnoff 			int maxhlen, hlen;
68982cd038dSYoshinobu Inoue 
69018706985SJINMEI Tatuya 			/*
69118706985SJINMEI Tatuya 			 * XXX: this combination of flags is pointless,
69218706985SJINMEI Tatuya 			 * but should we keep this for compatibility?
69318706985SJINMEI Tatuya 			 */
694c81c183dSMark Johnston 			if ((V_icmp6_nodeinfo & (ICMP6_NODEINFO_FQDNOK |
695c81c183dSMark Johnston 			    ICMP6_NODEINFO_TMPADDROK)) !=
696c81c183dSMark Johnston 			    (ICMP6_NODEINFO_FQDNOK | ICMP6_NODEINFO_TMPADDROK))
69733841545SHajimu UMEMOTO 				break;
69833841545SHajimu UMEMOTO 
699686cdd19SJun-ichiro itojun Hagino 			if (code != 0)
700686cdd19SJun-ichiro itojun Hagino 				goto badcode;
70110e5acc3SGleb Smirnoff 
70210e5acc3SGleb Smirnoff 			CTASSERT(sizeof(*nip6) + sizeof(*nicmp6) + 4 <= MHLEN);
70310e5acc3SGleb Smirnoff 			n = m_gethdr(M_NOWAIT, m->m_type);
70410e5acc3SGleb Smirnoff 			if (n == NULL) {
705686cdd19SJun-ichiro itojun Hagino 				/* Give up remote */
706686cdd19SJun-ichiro itojun Hagino 				break;
707686cdd19SJun-ichiro itojun Hagino 			}
70810e5acc3SGleb Smirnoff 			if (!m_dup_pkthdr(n, m, M_NOWAIT)) {
7099967cafcSSam Leffler 				/*
7109967cafcSSam Leffler 				 * Previous code did a blind M_COPY_PKTHDR
7119967cafcSSam Leffler 				 * and said "just for rcvif".  If true, then
7129967cafcSSam Leffler 				 * we could tolerate the dup failing (due to
7139967cafcSSam Leffler 				 * the deep copy of the tag chain).  For now
7149967cafcSSam Leffler 				 * be conservative and just fail.
7159967cafcSSam Leffler 				 */
7169967cafcSSam Leffler 				m_free(n);
7179967cafcSSam Leffler 				n = NULL;
718fb043945SJonathan T. Looney 				break;
7199967cafcSSam Leffler 			}
72082cd038dSYoshinobu Inoue 			/*
72182cd038dSYoshinobu Inoue 			 * Copy IPv6 and ICMPv6 only.
72282cd038dSYoshinobu Inoue 			 */
72382cd038dSYoshinobu Inoue 			nip6 = mtod(n, struct ip6_hdr *);
72482cd038dSYoshinobu Inoue 			bcopy(ip6, nip6, sizeof(struct ip6_hdr));
72582cd038dSYoshinobu Inoue 			nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
72682cd038dSYoshinobu Inoue 			bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
72782cd038dSYoshinobu Inoue 			p = (u_char *)(nicmp6 + 1);
72882cd038dSYoshinobu Inoue 			bzero(p, 4);
7297460ef5dSHiroki Sato 
7307460ef5dSHiroki Sato 			maxhlen = M_TRAILINGSPACE(n) -
7317460ef5dSHiroki Sato 			    (sizeof(*nip6) + sizeof(*nicmp6) + 4);
7327460ef5dSHiroki Sato 			mtx_lock(&pr->pr_mtx);
7337460ef5dSHiroki Sato 			hlen = strlen(pr->pr_hostname);
7347460ef5dSHiroki Sato 			if (maxhlen > hlen)
7357460ef5dSHiroki Sato 				maxhlen = hlen;
736c1f19219SJamie Gritton 			/* meaningless TTL */
737c1f19219SJamie Gritton 			bcopy(pr->pr_hostname, p + 4, maxhlen);
73876ca6f88SJamie Gritton 			mtx_unlock(&pr->pr_mtx);
73982cd038dSYoshinobu Inoue 			noff = sizeof(struct ip6_hdr);
74082cd038dSYoshinobu Inoue 			n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
741686cdd19SJun-ichiro itojun Hagino 				sizeof(struct icmp6_hdr) + 4 + maxhlen;
74282cd038dSYoshinobu Inoue 			nicmp6->icmp6_type = ICMP6_WRUREPLY;
74382cd038dSYoshinobu Inoue 			nicmp6->icmp6_code = 0;
74482cd038dSYoshinobu Inoue 		}
74582cd038dSYoshinobu Inoue 		if (n) {
746e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_reflect);
747e27b0c87SRobert Watson 			ICMP6STAT_INC(icp6s_outhist[ICMP6_WRUREPLY]);
74882cd038dSYoshinobu Inoue 			icmp6_reflect(n, noff);
74982cd038dSYoshinobu Inoue 		}
75082cd038dSYoshinobu Inoue 		break;
75182cd038dSYoshinobu Inoue 	    }
75282cd038dSYoshinobu Inoue 
75382cd038dSYoshinobu Inoue 	case ICMP6_WRUREPLY:
75482cd038dSYoshinobu Inoue 		if (code != 0)
75582cd038dSYoshinobu Inoue 			goto badcode;
75682cd038dSYoshinobu Inoue 		break;
75782cd038dSYoshinobu Inoue 
75882cd038dSYoshinobu Inoue 	case ND_ROUTER_SOLICIT:
75929dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_routersolicit);
76082cd038dSYoshinobu Inoue 		if (code != 0)
76182cd038dSYoshinobu Inoue 			goto badcode;
76282cd038dSYoshinobu Inoue 		if (icmp6len < sizeof(struct nd_router_solicit))
76382cd038dSYoshinobu Inoue 			goto badlen;
7641db8d1f8SAna Kukec 		if (send_sendso_input_hook != NULL) {
765a4adf6ccSBjoern A. Zeeb 			if (m->m_len < off + icmp6len) {
766a61b5cfbSBjoern A. Zeeb 				m = m_pullup(m, off + icmp6len);
767a61b5cfbSBjoern A. Zeeb 				if (m == NULL) {
768a61b5cfbSBjoern A. Zeeb 					IP6STAT_INC(ip6s_exthdrtoolong);
769a61b5cfbSBjoern A. Zeeb 					*mp = NULL;
770a61b5cfbSBjoern A. Zeeb 					return (IPPROTO_DONE);
771a61b5cfbSBjoern A. Zeeb 				}
772a4adf6ccSBjoern A. Zeeb 			}
7732d12d25cSMark Johnston 			error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
7742d12d25cSMark Johnston 			if (error == 0) {
775686cdd19SJun-ichiro itojun Hagino 				m = NULL;
776686cdd19SJun-ichiro itojun Hagino 				goto freeit;
777686cdd19SJun-ichiro itojun Hagino 			}
7782d12d25cSMark Johnston 		}
7792d12d25cSMark Johnston 		n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
7802d12d25cSMark Johnston 		nd6_rs_input(m, off, icmp6len);
7812d12d25cSMark Johnston 		m = n;
7822d12d25cSMark Johnston 		if (m == NULL)
783e7a6db74SAna Kukec 			goto freeit;
78482cd038dSYoshinobu Inoue 		break;
78582cd038dSYoshinobu Inoue 
78682cd038dSYoshinobu Inoue 	case ND_ROUTER_ADVERT:
78729dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_routeradvert);
78882cd038dSYoshinobu Inoue 		if (code != 0)
78982cd038dSYoshinobu Inoue 			goto badcode;
79082cd038dSYoshinobu Inoue 		if (icmp6len < sizeof(struct nd_router_advert))
79182cd038dSYoshinobu Inoue 			goto badlen;
7921db8d1f8SAna Kukec 		if (send_sendso_input_hook != NULL) {
7932d12d25cSMark Johnston 			error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
7942d12d25cSMark Johnston 			if (error == 0) {
795686cdd19SJun-ichiro itojun Hagino 				m = NULL;
796686cdd19SJun-ichiro itojun Hagino 				goto freeit;
797686cdd19SJun-ichiro itojun Hagino 			}
7982d12d25cSMark Johnston 		}
7992d12d25cSMark Johnston 		n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
8002d12d25cSMark Johnston 		nd6_ra_input(m, off, icmp6len);
8012d12d25cSMark Johnston 		m = n;
8022d12d25cSMark Johnston 		if (m == NULL)
803e7a6db74SAna Kukec 			goto freeit;
80482cd038dSYoshinobu Inoue 		break;
80582cd038dSYoshinobu Inoue 
80682cd038dSYoshinobu Inoue 	case ND_NEIGHBOR_SOLICIT:
80729dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_neighborsolicit);
80882cd038dSYoshinobu Inoue 		if (code != 0)
80982cd038dSYoshinobu Inoue 			goto badcode;
81082cd038dSYoshinobu Inoue 		if (icmp6len < sizeof(struct nd_neighbor_solicit))
81182cd038dSYoshinobu Inoue 			goto badlen;
8121db8d1f8SAna Kukec 		if (send_sendso_input_hook != NULL) {
8132d12d25cSMark Johnston 			error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
8142d12d25cSMark Johnston 			if (error == 0) {
815686cdd19SJun-ichiro itojun Hagino 				m = NULL;
816686cdd19SJun-ichiro itojun Hagino 				goto freeit;
817686cdd19SJun-ichiro itojun Hagino 			}
8182d12d25cSMark Johnston 		}
8192d12d25cSMark Johnston 		n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
8202d12d25cSMark Johnston 		nd6_ns_input(m, off, icmp6len);
8212d12d25cSMark Johnston 		m = n;
8222d12d25cSMark Johnston 		if (m == NULL)
823e7a6db74SAna Kukec 			goto freeit;
82482cd038dSYoshinobu Inoue 		break;
82582cd038dSYoshinobu Inoue 
82682cd038dSYoshinobu Inoue 	case ND_NEIGHBOR_ADVERT:
82729dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_neighboradvert);
82882cd038dSYoshinobu Inoue 		if (code != 0)
82982cd038dSYoshinobu Inoue 			goto badcode;
83082cd038dSYoshinobu Inoue 		if (icmp6len < sizeof(struct nd_neighbor_advert))
83182cd038dSYoshinobu Inoue 			goto badlen;
8321db8d1f8SAna Kukec 		if (send_sendso_input_hook != NULL) {
8332d12d25cSMark Johnston 			error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
8342d12d25cSMark Johnston 			if (error == 0) {
835686cdd19SJun-ichiro itojun Hagino 				m = NULL;
836686cdd19SJun-ichiro itojun Hagino 				goto freeit;
837686cdd19SJun-ichiro itojun Hagino 			}
8382d12d25cSMark Johnston 		}
8392d12d25cSMark Johnston 		n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
8402d12d25cSMark Johnston 		nd6_na_input(m, off, icmp6len);
8412d12d25cSMark Johnston 		m = n;
8422d12d25cSMark Johnston 		if (m == NULL)
843e7a6db74SAna Kukec 			goto freeit;
84482cd038dSYoshinobu Inoue 		break;
84582cd038dSYoshinobu Inoue 
84682cd038dSYoshinobu Inoue 	case ND_REDIRECT:
84729dc7bc6SBruce M Simpson 		icmp6_ifstat_inc(ifp, ifs6_in_redirect);
84882cd038dSYoshinobu Inoue 		if (code != 0)
84982cd038dSYoshinobu Inoue 			goto badcode;
85082cd038dSYoshinobu Inoue 		if (icmp6len < sizeof(struct nd_redirect))
85182cd038dSYoshinobu Inoue 			goto badlen;
8521db8d1f8SAna Kukec 		if (send_sendso_input_hook != NULL) {
8532d12d25cSMark Johnston 			error = send_sendso_input_hook(m, ifp, SND_IN, ip6len);
8542d12d25cSMark Johnston 			if (error == 0) {
855686cdd19SJun-ichiro itojun Hagino 				m = NULL;
856686cdd19SJun-ichiro itojun Hagino 				goto freeit;
857686cdd19SJun-ichiro itojun Hagino 			}
8582d12d25cSMark Johnston 		}
8592d12d25cSMark Johnston 		n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
8602d12d25cSMark Johnston 		icmp6_redirect_input(m, off);
8612d12d25cSMark Johnston 		m = n;
8622d12d25cSMark Johnston 		if (m == NULL)
863e7a6db74SAna Kukec 			goto freeit;
86482cd038dSYoshinobu Inoue 		break;
86582cd038dSYoshinobu Inoue 
86682cd038dSYoshinobu Inoue 	case ICMP6_ROUTER_RENUMBERING:
86782cd038dSYoshinobu Inoue 		if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
86882cd038dSYoshinobu Inoue 		    code != ICMP6_ROUTER_RENUMBERING_RESULT)
86982cd038dSYoshinobu Inoue 			goto badcode;
87082cd038dSYoshinobu Inoue 		if (icmp6len < sizeof(struct icmp6_router_renum))
87182cd038dSYoshinobu Inoue 			goto badlen;
87282cd038dSYoshinobu Inoue 		break;
87382cd038dSYoshinobu Inoue 
87482cd038dSYoshinobu Inoue 	default:
87533841545SHajimu UMEMOTO 		nd6log((LOG_DEBUG,
87633841545SHajimu UMEMOTO 		    "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
8771d54aa3bSBjoern A. Zeeb 		    icmp6->icmp6_type, ip6_sprintf(ip6bufs, &ip6->ip6_src),
8781d54aa3bSBjoern A. Zeeb 		    ip6_sprintf(ip6bufd, &ip6->ip6_dst),
87929dc7bc6SBruce M Simpson 		    ifp ? ifp->if_index : 0));
88082cd038dSYoshinobu Inoue 		if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
88182cd038dSYoshinobu Inoue 			/* ICMPv6 error: MUST deliver it by spec... */
882fcb3f813SGleb Smirnoff 			goto deliver;
88382cd038dSYoshinobu Inoue 		} else {
88482cd038dSYoshinobu Inoue 			/* ICMPv6 informational: MUST not deliver */
88582cd038dSYoshinobu Inoue 			break;
88682cd038dSYoshinobu Inoue 		}
88782cd038dSYoshinobu Inoue 	deliver:
888fcb3f813SGleb Smirnoff 		if (icmp6_notify_error(&m, off, icmp6len) != 0) {
88933841545SHajimu UMEMOTO 			/* In this case, m should've been freed. */
890a8fe77d8SBjoern A. Zeeb 			*mp = NULL;
89133841545SHajimu UMEMOTO 			return (IPPROTO_DONE);
89233841545SHajimu UMEMOTO 		}
89333841545SHajimu UMEMOTO 		break;
89433841545SHajimu UMEMOTO 
89533841545SHajimu UMEMOTO 	badcode:
896e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_badcode);
89733841545SHajimu UMEMOTO 		break;
89833841545SHajimu UMEMOTO 
89933841545SHajimu UMEMOTO 	badlen:
900e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_badlen);
90133841545SHajimu UMEMOTO 		break;
90233841545SHajimu UMEMOTO 	}
90333841545SHajimu UMEMOTO 
90433841545SHajimu UMEMOTO 	/* deliver the packet to appropriate sockets */
90533841545SHajimu UMEMOTO 	icmp6_rip6_input(&m, *offp);
90633841545SHajimu UMEMOTO 
907a8fe77d8SBjoern A. Zeeb 	*mp = m;
908a8fe77d8SBjoern A. Zeeb 	return (IPPROTO_DONE);
90933841545SHajimu UMEMOTO 
91033841545SHajimu UMEMOTO  freeit:
91133841545SHajimu UMEMOTO 	m_freem(m);
912a8fe77d8SBjoern A. Zeeb 	*mp = NULL;
913a8fe77d8SBjoern A. Zeeb 	return (IPPROTO_DONE);
91433841545SHajimu UMEMOTO }
91533841545SHajimu UMEMOTO 
91633841545SHajimu UMEMOTO static int
917fcb3f813SGleb Smirnoff icmp6_notify_error(struct mbuf **mp, int off, int icmp6len)
91833841545SHajimu UMEMOTO {
919503f4e47SBjoern A. Zeeb 	struct mbuf *m;
92033841545SHajimu UMEMOTO 	struct icmp6_hdr *icmp6;
92133841545SHajimu UMEMOTO 	struct ip6_hdr *eip6;
92233841545SHajimu UMEMOTO 	u_int32_t notifymtu;
92333841545SHajimu UMEMOTO 	struct sockaddr_in6 icmp6src, icmp6dst;
92433841545SHajimu UMEMOTO 
925503f4e47SBjoern A. Zeeb 	m = *mp;
926503f4e47SBjoern A. Zeeb 
92782cd038dSYoshinobu Inoue 	if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
928e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_tooshort);
92982cd038dSYoshinobu Inoue 		goto freeit;
93082cd038dSYoshinobu Inoue 	}
931a61b5cfbSBjoern A. Zeeb 
932a4adf6ccSBjoern A. Zeeb 	if (m->m_len < off + sizeof(*icmp6) + sizeof(struct ip6_hdr)) {
933a61b5cfbSBjoern A. Zeeb 		m = m_pullup(m, off + sizeof(*icmp6) + sizeof(struct ip6_hdr));
934a61b5cfbSBjoern A. Zeeb 		if (m == NULL) {
935a61b5cfbSBjoern A. Zeeb 			IP6STAT_INC(ip6s_exthdrtoolong);
936a61b5cfbSBjoern A. Zeeb 			*mp = m;
93733841545SHajimu UMEMOTO 			return (-1);
938686cdd19SJun-ichiro itojun Hagino 		}
939a4adf6ccSBjoern A. Zeeb 	}
940a61b5cfbSBjoern A. Zeeb 	icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
94133841545SHajimu UMEMOTO 	eip6 = (struct ip6_hdr *)(icmp6 + 1);
942d9999ae9SAlexander V. Chernikov 	bzero(&icmp6dst, sizeof(icmp6dst));
94382cd038dSYoshinobu Inoue 
94482cd038dSYoshinobu Inoue 	/* Detect the upper level protocol */
94582cd038dSYoshinobu Inoue 	{
94682cd038dSYoshinobu Inoue 		u_int8_t nxt = eip6->ip6_nxt;
94782cd038dSYoshinobu Inoue 		int eoff = off + sizeof(struct icmp6_hdr) +
94882cd038dSYoshinobu Inoue 		    sizeof(struct ip6_hdr);
94982cd038dSYoshinobu Inoue 		struct ip6ctlparam ip6cp;
950686cdd19SJun-ichiro itojun Hagino 		int icmp6type = icmp6->icmp6_type;
951686cdd19SJun-ichiro itojun Hagino 		struct ip6_frag *fh;
952686cdd19SJun-ichiro itojun Hagino 		struct ip6_rthdr *rth;
953686cdd19SJun-ichiro itojun Hagino 		struct ip6_rthdr0 *rth0;
954686cdd19SJun-ichiro itojun Hagino 		int rthlen;
95582cd038dSYoshinobu Inoue 
95688ff5695SSUZUKI Shinsuke 		while (1) { /* XXX: should avoid infinite loop explicitly? */
95782cd038dSYoshinobu Inoue 			struct ip6_ext *eh;
95882cd038dSYoshinobu Inoue 
95982cd038dSYoshinobu Inoue 			switch (nxt) {
96082cd038dSYoshinobu Inoue 			case IPPROTO_HOPOPTS:
96182cd038dSYoshinobu Inoue 			case IPPROTO_DSTOPTS:
96282cd038dSYoshinobu Inoue 			case IPPROTO_AH:
963a4adf6ccSBjoern A. Zeeb 				if (m->m_len < eoff + sizeof(struct ip6_ext)) {
964a4adf6ccSBjoern A. Zeeb 					m = m_pullup(m, eoff +
965a4adf6ccSBjoern A. Zeeb 					    sizeof(struct ip6_ext));
966a61b5cfbSBjoern A. Zeeb 					if (m == NULL) {
967a61b5cfbSBjoern A. Zeeb 						IP6STAT_INC(ip6s_exthdrtoolong);
968a61b5cfbSBjoern A. Zeeb 						*mp = m;
96933841545SHajimu UMEMOTO 						return (-1);
970686cdd19SJun-ichiro itojun Hagino 					}
971a4adf6ccSBjoern A. Zeeb 				}
972a61b5cfbSBjoern A. Zeeb 				eh = (struct ip6_ext *)
973a61b5cfbSBjoern A. Zeeb 				    (mtod(m, caddr_t) + eoff);
97482cd038dSYoshinobu Inoue 				if (nxt == IPPROTO_AH)
97582cd038dSYoshinobu Inoue 					eoff += (eh->ip6e_len + 2) << 2;
97682cd038dSYoshinobu Inoue 				else
97782cd038dSYoshinobu Inoue 					eoff += (eh->ip6e_len + 1) << 3;
97882cd038dSYoshinobu Inoue 				nxt = eh->ip6e_nxt;
97982cd038dSYoshinobu Inoue 				break;
980686cdd19SJun-ichiro itojun Hagino 			case IPPROTO_ROUTING:
981686cdd19SJun-ichiro itojun Hagino 				/*
982686cdd19SJun-ichiro itojun Hagino 				 * When the erroneous packet contains a
983686cdd19SJun-ichiro itojun Hagino 				 * routing header, we should examine the
984686cdd19SJun-ichiro itojun Hagino 				 * header to determine the final destination.
985686cdd19SJun-ichiro itojun Hagino 				 * Otherwise, we can't properly update
986686cdd19SJun-ichiro itojun Hagino 				 * information that depends on the final
987686cdd19SJun-ichiro itojun Hagino 				 * destination (e.g. path MTU).
988686cdd19SJun-ichiro itojun Hagino 				 */
989a4adf6ccSBjoern A. Zeeb 				if (m->m_len < eoff + sizeof(*rth)) {
990a61b5cfbSBjoern A. Zeeb 					m = m_pullup(m, eoff + sizeof(*rth));
991a61b5cfbSBjoern A. Zeeb 					if (m == NULL) {
992a61b5cfbSBjoern A. Zeeb 						IP6STAT_INC(ip6s_exthdrtoolong);
993a61b5cfbSBjoern A. Zeeb 						*mp = m;
99433841545SHajimu UMEMOTO 						return (-1);
995686cdd19SJun-ichiro itojun Hagino 					}
996a4adf6ccSBjoern A. Zeeb 				}
997a61b5cfbSBjoern A. Zeeb 				rth = (struct ip6_rthdr *)
998a61b5cfbSBjoern A. Zeeb 				    (mtod(m, caddr_t) + eoff);
999686cdd19SJun-ichiro itojun Hagino 				rthlen = (rth->ip6r_len + 1) << 3;
1000686cdd19SJun-ichiro itojun Hagino 				/*
1001686cdd19SJun-ichiro itojun Hagino 				 * XXX: currently there is no
1002686cdd19SJun-ichiro itojun Hagino 				 * officially defined type other
1003686cdd19SJun-ichiro itojun Hagino 				 * than type-0.
1004686cdd19SJun-ichiro itojun Hagino 				 * Note that if the segment left field
1005686cdd19SJun-ichiro itojun Hagino 				 * is 0, all intermediate hops must
1006686cdd19SJun-ichiro itojun Hagino 				 * have been passed.
1007686cdd19SJun-ichiro itojun Hagino 				 */
1008686cdd19SJun-ichiro itojun Hagino 				if (rth->ip6r_segleft &&
1009686cdd19SJun-ichiro itojun Hagino 				    rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
1010686cdd19SJun-ichiro itojun Hagino 					int hops;
1011686cdd19SJun-ichiro itojun Hagino 
1012a4adf6ccSBjoern A. Zeeb 					if (m->m_len < eoff + rthlen) {
1013a61b5cfbSBjoern A. Zeeb 						m = m_pullup(m, eoff + rthlen);
1014a61b5cfbSBjoern A. Zeeb 						if (m == NULL) {
1015a4adf6ccSBjoern A. Zeeb 							IP6STAT_INC(
1016a4adf6ccSBjoern A. Zeeb 							    ip6s_exthdrtoolong);
1017a61b5cfbSBjoern A. Zeeb 							*mp = m;
101833841545SHajimu UMEMOTO 							return (-1);
1019686cdd19SJun-ichiro itojun Hagino 						}
1020a4adf6ccSBjoern A. Zeeb 					}
1021a61b5cfbSBjoern A. Zeeb 					rth0 = (struct ip6_rthdr0 *)
1022a61b5cfbSBjoern A. Zeeb 					    (mtod(m, caddr_t) + eoff);
1023d9999ae9SAlexander V. Chernikov 
1024686cdd19SJun-ichiro itojun Hagino 					/* just ignore a bogus header */
1025686cdd19SJun-ichiro itojun Hagino 					if ((rth0->ip6r0_len % 2) == 0 &&
1026686cdd19SJun-ichiro itojun Hagino 					    (hops = rth0->ip6r0_len/2))
1027d9999ae9SAlexander V. Chernikov 						icmp6dst.sin6_addr = *((struct in6_addr *)(rth0 + 1) + (hops - 1));
1028686cdd19SJun-ichiro itojun Hagino 				}
1029686cdd19SJun-ichiro itojun Hagino 				eoff += rthlen;
1030686cdd19SJun-ichiro itojun Hagino 				nxt = rth->ip6r_nxt;
1031686cdd19SJun-ichiro itojun Hagino 				break;
1032686cdd19SJun-ichiro itojun Hagino 			case IPPROTO_FRAGMENT:
1033a4adf6ccSBjoern A. Zeeb 				if (m->m_len < eoff + sizeof(struct ip6_frag)) {
1034a4adf6ccSBjoern A. Zeeb 					m = m_pullup(m, eoff +
1035a4adf6ccSBjoern A. Zeeb 					    sizeof(struct ip6_frag));
1036a61b5cfbSBjoern A. Zeeb 					if (m == NULL) {
1037a61b5cfbSBjoern A. Zeeb 						IP6STAT_INC(ip6s_exthdrtoolong);
1038a61b5cfbSBjoern A. Zeeb 						*mp = m;
103933841545SHajimu UMEMOTO 						return (-1);
1040686cdd19SJun-ichiro itojun Hagino 					}
1041a4adf6ccSBjoern A. Zeeb 				}
1042a61b5cfbSBjoern A. Zeeb 				fh = (struct ip6_frag *)(mtod(m, caddr_t) +
1043a61b5cfbSBjoern A. Zeeb 				    eoff);
1044686cdd19SJun-ichiro itojun Hagino 				/*
1045686cdd19SJun-ichiro itojun Hagino 				 * Data after a fragment header is meaningless
1046686cdd19SJun-ichiro itojun Hagino 				 * unless it is the first fragment, but
1047686cdd19SJun-ichiro itojun Hagino 				 * we'll go to the notify label for path MTU
1048686cdd19SJun-ichiro itojun Hagino 				 * discovery.
1049686cdd19SJun-ichiro itojun Hagino 				 */
1050686cdd19SJun-ichiro itojun Hagino 				if (fh->ip6f_offlg & IP6F_OFF_MASK)
1051686cdd19SJun-ichiro itojun Hagino 					goto notify;
1052686cdd19SJun-ichiro itojun Hagino 
1053686cdd19SJun-ichiro itojun Hagino 				eoff += sizeof(struct ip6_frag);
1054686cdd19SJun-ichiro itojun Hagino 				nxt = fh->ip6f_nxt;
1055686cdd19SJun-ichiro itojun Hagino 				break;
105682cd038dSYoshinobu Inoue 			default:
1057686cdd19SJun-ichiro itojun Hagino 				/*
1058686cdd19SJun-ichiro itojun Hagino 				 * This case includes ESP and the No Next
1059686cdd19SJun-ichiro itojun Hagino 				 * Header.  In such cases going to the notify
1060686cdd19SJun-ichiro itojun Hagino 				 * label does not have any meaning
1061686cdd19SJun-ichiro itojun Hagino 				 * (i.e. ctlfunc will be NULL), but we go
1062686cdd19SJun-ichiro itojun Hagino 				 * anyway since we might have to update
1063686cdd19SJun-ichiro itojun Hagino 				 * path MTU information.
1064686cdd19SJun-ichiro itojun Hagino 				 */
106582cd038dSYoshinobu Inoue 				goto notify;
106682cd038dSYoshinobu Inoue 			}
106782cd038dSYoshinobu Inoue 		}
106882cd038dSYoshinobu Inoue 	  notify:
106982cd038dSYoshinobu Inoue 		icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
107033841545SHajimu UMEMOTO 
107106cd0a3fSHajimu UMEMOTO 		/*
107206cd0a3fSHajimu UMEMOTO 		 * retrieve parameters from the inner IPv6 header, and convert
107306cd0a3fSHajimu UMEMOTO 		 * them into sockaddr structures.
107406cd0a3fSHajimu UMEMOTO 		 * XXX: there is no guarantee that the source or destination
107506cd0a3fSHajimu UMEMOTO 		 * addresses of the inner packet are in the same scope as
107606cd0a3fSHajimu UMEMOTO 		 * the addresses of the icmp packet.  But there is no other
107706cd0a3fSHajimu UMEMOTO 		 * way to determine the zone.
107806cd0a3fSHajimu UMEMOTO 		 */
107933841545SHajimu UMEMOTO 		eip6 = (struct ip6_hdr *)(icmp6 + 1);
108006cd0a3fSHajimu UMEMOTO 
1081aa71d6b4SMark Johnston 		/*
1082aa71d6b4SMark Johnston 		 * Protocol layers can't do anything useful with unspecified
1083aa71d6b4SMark Johnston 		 * addresses.
1084aa71d6b4SMark Johnston 		 */
1085aa71d6b4SMark Johnston 		if (IN6_IS_ADDR_UNSPECIFIED(&eip6->ip6_src) ||
1086aa71d6b4SMark Johnston 		    IN6_IS_ADDR_UNSPECIFIED(&eip6->ip6_dst))
1087aa71d6b4SMark Johnston 			goto freeit;
1088aa71d6b4SMark Johnston 
108933841545SHajimu UMEMOTO 		icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
109033841545SHajimu UMEMOTO 		icmp6dst.sin6_family = AF_INET6;
1091d9999ae9SAlexander V. Chernikov 		if (IN6_IS_ADDR_UNSPECIFIED(&icmp6dst.sin6_addr))
109233841545SHajimu UMEMOTO 			icmp6dst.sin6_addr = eip6->ip6_dst;
1093a1f7e5f8SHajimu UMEMOTO 		if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL))
10949a4f9608SHajimu UMEMOTO 			goto freeit;
109533841545SHajimu UMEMOTO 		bzero(&icmp6src, sizeof(icmp6src));
109633841545SHajimu UMEMOTO 		icmp6src.sin6_len = sizeof(struct sockaddr_in6);
109733841545SHajimu UMEMOTO 		icmp6src.sin6_family = AF_INET6;
109833841545SHajimu UMEMOTO 		icmp6src.sin6_addr = eip6->ip6_src;
1099a1f7e5f8SHajimu UMEMOTO 		if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL))
11009a4f9608SHajimu UMEMOTO 			goto freeit;
1101a1f7e5f8SHajimu UMEMOTO 		icmp6src.sin6_flowinfo =
1102a1f7e5f8SHajimu UMEMOTO 		    (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
110333841545SHajimu UMEMOTO 
110433841545SHajimu UMEMOTO 		ip6cp.ip6c_m = m;
110533841545SHajimu UMEMOTO 		ip6cp.ip6c_icmp6 = icmp6;
110633841545SHajimu UMEMOTO 		ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
110733841545SHajimu UMEMOTO 		ip6cp.ip6c_off = eoff;
1108fcb3f813SGleb Smirnoff 		ip6cp.ip6c_finaldst = &icmp6dst;
110933841545SHajimu UMEMOTO 		ip6cp.ip6c_src = &icmp6src;
111033841545SHajimu UMEMOTO 		ip6cp.ip6c_nxt = nxt;
111133841545SHajimu UMEMOTO 
111233841545SHajimu UMEMOTO 		if (icmp6type == ICMP6_PACKET_TOO_BIG) {
111333841545SHajimu UMEMOTO 			notifymtu = ntohl(icmp6->icmp6_mtu);
111433841545SHajimu UMEMOTO 			ip6cp.ip6c_cmdarg = (void *)&notifymtu;
111533841545SHajimu UMEMOTO 			icmp6_mtudisc_update(&ip6cp, 1);	/*XXX*/
1116686cdd19SJun-ichiro itojun Hagino 		}
1117686cdd19SJun-ichiro itojun Hagino 
111878b1fc05SGleb Smirnoff 		if (ip6_ctlprotox[nxt] != NULL)
1119fcb3f813SGleb Smirnoff 			ip6_ctlprotox[nxt](&ip6cp);
112082cd038dSYoshinobu Inoue 	}
11219c0fda72SHajimu UMEMOTO 	*mp = m;
112233841545SHajimu UMEMOTO 	return (0);
112382cd038dSYoshinobu Inoue 
112482cd038dSYoshinobu Inoue   freeit:
112582cd038dSYoshinobu Inoue 	m_freem(m);
1126a8fe77d8SBjoern A. Zeeb 	*mp = NULL;
112733841545SHajimu UMEMOTO 	return (-1);
112882cd038dSYoshinobu Inoue }
112982cd038dSYoshinobu Inoue 
113033841545SHajimu UMEMOTO void
11311272577eSXin LI icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
1132686cdd19SJun-ichiro itojun Hagino {
1133fcb3f813SGleb Smirnoff 	struct in6_addr *dst = &ip6cp->ip6c_finaldst->sin6_addr;
113433841545SHajimu UMEMOTO 	struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
113533841545SHajimu UMEMOTO 	struct mbuf *m = ip6cp->ip6c_m;	/* will be necessary for scope issue */
1136686cdd19SJun-ichiro itojun Hagino 	u_int mtu = ntohl(icmp6->icmp6_mtu);
113797d8d152SAndre Oppermann 	struct in_conninfo inc;
113882042465SKornel Dulęba 	uint32_t max_mtu;
1139686cdd19SJun-ichiro itojun Hagino 
1140f95d4633SHajimu UMEMOTO #if 0
1141f95d4633SHajimu UMEMOTO 	/*
1142f95d4633SHajimu UMEMOTO 	 * RFC2460 section 5, last paragraph.
1143f95d4633SHajimu UMEMOTO 	 * even though minimum link MTU for IPv6 is IPV6_MMTU,
1144f95d4633SHajimu UMEMOTO 	 * we may see ICMPv6 too big with mtu < IPV6_MMTU
1145f95d4633SHajimu UMEMOTO 	 * due to packet translator in the middle.
1146f95d4633SHajimu UMEMOTO 	 * see ip6_output() and ip6_getpmtu() "alwaysfrag" case for
1147f95d4633SHajimu UMEMOTO 	 * special handling.
1148f95d4633SHajimu UMEMOTO 	 */
1149f95d4633SHajimu UMEMOTO 	if (mtu < IPV6_MMTU)
1150f95d4633SHajimu UMEMOTO 		return;
1151f95d4633SHajimu UMEMOTO #endif
1152f95d4633SHajimu UMEMOTO 
1153f95d4633SHajimu UMEMOTO 	/*
1154f95d4633SHajimu UMEMOTO 	 * we reject ICMPv6 too big with abnormally small value.
1155f95d4633SHajimu UMEMOTO 	 * XXX what is the good definition of "abnormally small"?
1156f95d4633SHajimu UMEMOTO 	 */
1157f95d4633SHajimu UMEMOTO 	if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8)
1158f95d4633SHajimu UMEMOTO 		return;
1159f95d4633SHajimu UMEMOTO 
116033841545SHajimu UMEMOTO 	if (!validated)
116133841545SHajimu UMEMOTO 		return;
116233841545SHajimu UMEMOTO 
116359ca51adSSimon L. B. Nielsen 	/*
116459ca51adSSimon L. B. Nielsen 	 * In case the suggested mtu is less than IPV6_MMTU, we
116559ca51adSSimon L. B. Nielsen 	 * only need to remember that it was for above mentioned
116659ca51adSSimon L. B. Nielsen 	 * "alwaysfrag" case.
116759ca51adSSimon L. B. Nielsen 	 * Try to be as close to the spec as possible.
116859ca51adSSimon L. B. Nielsen 	 */
116959ca51adSSimon L. B. Nielsen 	if (mtu < IPV6_MMTU)
117059ca51adSSimon L. B. Nielsen 		mtu = IPV6_MMTU - 8;
117159ca51adSSimon L. B. Nielsen 
117297d8d152SAndre Oppermann 	bzero(&inc, sizeof(inc));
1173baa09f18SAndrey V. Elsukov 	inc.inc_fibnum = M_GETFIB(m);
1174dcdb4371SBjoern A. Zeeb 	inc.inc_flags |= INC_ISIPV6;
117597d8d152SAndre Oppermann 	inc.inc6_faddr = *dst;
1176a1f7e5f8SHajimu UMEMOTO 	if (in6_setscope(&inc.inc6_faddr, m->m_pkthdr.rcvif, NULL))
1177a1f7e5f8SHajimu UMEMOTO 		return;
1178686cdd19SJun-ichiro itojun Hagino 
117982042465SKornel Dulęba 	max_mtu = tcp_hc_getmtu(&inc);
118082042465SKornel Dulęba 	if (max_mtu == 0)
118182042465SKornel Dulęba 		max_mtu = tcp_maxmtu6(&inc, NULL);
118282042465SKornel Dulęba 
118382042465SKornel Dulęba 	if (mtu < max_mtu) {
118497d8d152SAndre Oppermann 		tcp_hc_updatemtu(&inc, mtu);
1185e27b0c87SRobert Watson 		ICMP6STAT_INC(icp6s_pmtuchg);
1186686cdd19SJun-ichiro itojun Hagino 	}
1187686cdd19SJun-ichiro itojun Hagino }
1188686cdd19SJun-ichiro itojun Hagino 
118982cd038dSYoshinobu Inoue /*
119033841545SHajimu UMEMOTO  * Process a Node Information Query packet, based on
119133841545SHajimu UMEMOTO  * draft-ietf-ipngwg-icmp-name-lookups-07.
1192686cdd19SJun-ichiro itojun Hagino  *
1193686cdd19SJun-ichiro itojun Hagino  * Spec incompatibilities:
1194686cdd19SJun-ichiro itojun Hagino  * - IPv6 Subject address handling
1195686cdd19SJun-ichiro itojun Hagino  * - IPv4 Subject address handling support missing
1196686cdd19SJun-ichiro itojun Hagino  * - Proxy reply (answer even if it's not for me)
1197686cdd19SJun-ichiro itojun Hagino  * - joins NI group address at in6_ifattach() time only, does not cope
1198686cdd19SJun-ichiro itojun Hagino  *   with hostname changes by sethostname(3)
119982cd038dSYoshinobu Inoue  */
120082cd038dSYoshinobu Inoue static struct mbuf *
12017460ef5dSHiroki Sato ni6_input(struct mbuf *m, int off, struct prison *pr)
120282cd038dSYoshinobu Inoue {
1203686cdd19SJun-ichiro itojun Hagino 	struct icmp6_nodeinfo *ni6, *nni6;
120482cd038dSYoshinobu Inoue 	struct mbuf *n = NULL;
1205686cdd19SJun-ichiro itojun Hagino 	u_int16_t qtype;
1206686cdd19SJun-ichiro itojun Hagino 	int subjlen;
120782cd038dSYoshinobu Inoue 	int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
120882cd038dSYoshinobu Inoue 	struct ni_reply_fqdn *fqdn;
120982cd038dSYoshinobu Inoue 	int addrs;		/* for NI_QTYPE_NODEADDR */
121082cd038dSYoshinobu Inoue 	struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1211a1f7e5f8SHajimu UMEMOTO 	struct in6_addr in6_subj; /* subject address */
1212686cdd19SJun-ichiro itojun Hagino 	struct ip6_hdr *ip6;
1213686cdd19SJun-ichiro itojun Hagino 	int oldfqdn = 0;	/* if 1, return pascal string (03 draft) */
121433841545SHajimu UMEMOTO 	char *subj = NULL;
121533841545SHajimu UMEMOTO 	struct in6_ifaddr *ia6 = NULL;
121682cd038dSYoshinobu Inoue 
1217686cdd19SJun-ichiro itojun Hagino 	ip6 = mtod(m, struct ip6_hdr *);
1218686cdd19SJun-ichiro itojun Hagino 	ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1219686cdd19SJun-ichiro itojun Hagino 
1220686cdd19SJun-ichiro itojun Hagino 	/*
122118706985SJINMEI Tatuya 	 * Validate IPv6 source address.
122218706985SJINMEI Tatuya 	 * The default configuration MUST be to refuse answering queries from
122318706985SJINMEI Tatuya 	 * global-scope addresses according to RFC4602.
122418706985SJINMEI Tatuya 	 * Notes:
122518706985SJINMEI Tatuya 	 *  - it's not very clear what "refuse" means; this implementation
122618706985SJINMEI Tatuya 	 *    simply drops it.
122718706985SJINMEI Tatuya 	 *  - it's not very easy to identify global-scope (unicast) addresses
122818706985SJINMEI Tatuya 	 *    since there are many prefixes for them.  It should be safer
122918706985SJINMEI Tatuya 	 *    and in practice sufficient to check "all" but loopback and
123018706985SJINMEI Tatuya 	 *    link-local (note that site-local unicast was deprecated and
123118706985SJINMEI Tatuya 	 *    ULA is defined as global scope-wise)
123218706985SJINMEI Tatuya 	 */
1233603724d3SBjoern A. Zeeb 	if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 &&
123418706985SJINMEI Tatuya 	    !IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) &&
123518706985SJINMEI Tatuya 	    !IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
123618706985SJINMEI Tatuya 		goto bad;
123718706985SJINMEI Tatuya 
123818706985SJINMEI Tatuya 	/*
1239686cdd19SJun-ichiro itojun Hagino 	 * Validate IPv6 destination address.
1240686cdd19SJun-ichiro itojun Hagino 	 *
124133841545SHajimu UMEMOTO 	 * The Responder must discard the Query without further processing
124233841545SHajimu UMEMOTO 	 * unless it is one of the Responder's unicast or anycast addresses, or
124333841545SHajimu UMEMOTO 	 * a link-local scope multicast address which the Responder has joined.
124418706985SJINMEI Tatuya 	 * [RFC4602, Section 5.]
1245686cdd19SJun-ichiro itojun Hagino 	 */
12462a5aafceSHajimu UMEMOTO 	if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
12472a5aafceSHajimu UMEMOTO 		if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
12482a5aafceSHajimu UMEMOTO 			goto bad;
12492a5aafceSHajimu UMEMOTO 		/* else it's a link-local multicast, fine */
12502a5aafceSHajimu UMEMOTO 	} else {		/* unicast or anycast */
12518268d82cSAlexander V. Chernikov 		ia6 = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false);
12523e88eb90SAndrey V. Elsukov 		if (ia6 == NULL)
12532a5aafceSHajimu UMEMOTO 			goto bad; /* XXX impossible */
12542a5aafceSHajimu UMEMOTO 
12552a5aafceSHajimu UMEMOTO 		if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
1256603724d3SBjoern A. Zeeb 		    !(V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) {
125733841545SHajimu UMEMOTO 			nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
125833841545SHajimu UMEMOTO 				"a temporary address in %s:%d",
125933841545SHajimu UMEMOTO 			       __FILE__, __LINE__));
126033841545SHajimu UMEMOTO 			goto bad;
126133841545SHajimu UMEMOTO 		}
12622a5aafceSHajimu UMEMOTO 	}
1263686cdd19SJun-ichiro itojun Hagino 
1264686cdd19SJun-ichiro itojun Hagino 	/* validate query Subject field. */
126533841545SHajimu UMEMOTO 	qtype = ntohs(ni6->ni_qtype);
1266686cdd19SJun-ichiro itojun Hagino 	subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1267686cdd19SJun-ichiro itojun Hagino 	switch (qtype) {
1268686cdd19SJun-ichiro itojun Hagino 	case NI_QTYPE_NOOP:
1269686cdd19SJun-ichiro itojun Hagino 	case NI_QTYPE_SUPTYPES:
127033841545SHajimu UMEMOTO 		/* 07 draft */
127133841545SHajimu UMEMOTO 		if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1272686cdd19SJun-ichiro itojun Hagino 			break;
127333841545SHajimu UMEMOTO 		/* FALLTHROUGH */
1274686cdd19SJun-ichiro itojun Hagino 	case NI_QTYPE_FQDN:
1275686cdd19SJun-ichiro itojun Hagino 	case NI_QTYPE_NODEADDR:
1276a22adbc6SSUZUKI Shinsuke 	case NI_QTYPE_IPV4ADDR:
1277686cdd19SJun-ichiro itojun Hagino 		switch (ni6->ni_code) {
1278686cdd19SJun-ichiro itojun Hagino 		case ICMP6_NI_SUBJ_IPV6:
1279686cdd19SJun-ichiro itojun Hagino #if ICMP6_NI_SUBJ_IPV6 != 0
1280686cdd19SJun-ichiro itojun Hagino 		case 0:
1281686cdd19SJun-ichiro itojun Hagino #endif
1282686cdd19SJun-ichiro itojun Hagino 			/*
1283686cdd19SJun-ichiro itojun Hagino 			 * backward compatibility - try to accept 03 draft
1284686cdd19SJun-ichiro itojun Hagino 			 * format, where no Subject is present.
1285686cdd19SJun-ichiro itojun Hagino 			 */
128633841545SHajimu UMEMOTO 			if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
128733841545SHajimu UMEMOTO 			    subjlen == 0) {
1288686cdd19SJun-ichiro itojun Hagino 				oldfqdn++;
1289686cdd19SJun-ichiro itojun Hagino 				break;
1290686cdd19SJun-ichiro itojun Hagino 			}
129133841545SHajimu UMEMOTO #if ICMP6_NI_SUBJ_IPV6 != 0
129233841545SHajimu UMEMOTO 			if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
129333841545SHajimu UMEMOTO 				goto bad;
129433841545SHajimu UMEMOTO #endif
1295686cdd19SJun-ichiro itojun Hagino 
12962a5aafceSHajimu UMEMOTO 			if (subjlen != sizeof(struct in6_addr))
1297686cdd19SJun-ichiro itojun Hagino 				goto bad;
1298686cdd19SJun-ichiro itojun Hagino 
1299686cdd19SJun-ichiro itojun Hagino 			/*
1300686cdd19SJun-ichiro itojun Hagino 			 * Validate Subject address.
1301686cdd19SJun-ichiro itojun Hagino 			 *
130233841545SHajimu UMEMOTO 			 * Not sure what exactly "address belongs to the node"
130333841545SHajimu UMEMOTO 			 * means in the spec, is it just unicast, or what?
1304686cdd19SJun-ichiro itojun Hagino 			 *
1305686cdd19SJun-ichiro itojun Hagino 			 * At this moment we consider Subject address as
1306686cdd19SJun-ichiro itojun Hagino 			 * "belong to the node" if the Subject address equals
1307686cdd19SJun-ichiro itojun Hagino 			 * to the IPv6 destination address; validation for
1308686cdd19SJun-ichiro itojun Hagino 			 * IPv6 destination address should have done enough
1309686cdd19SJun-ichiro itojun Hagino 			 * check for us.
1310686cdd19SJun-ichiro itojun Hagino 			 *
1311686cdd19SJun-ichiro itojun Hagino 			 * We do not do proxy at this moment.
1312686cdd19SJun-ichiro itojun Hagino 			 */
1313686cdd19SJun-ichiro itojun Hagino 			m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1314a1f7e5f8SHajimu UMEMOTO 			    subjlen, (caddr_t)&in6_subj);
1315a1f7e5f8SHajimu UMEMOTO 			if (in6_setscope(&in6_subj, m->m_pkthdr.rcvif, NULL))
13169a4f9608SHajimu UMEMOTO 				goto bad;
13172a5aafceSHajimu UMEMOTO 
1318a1f7e5f8SHajimu UMEMOTO 			subj = (char *)&in6_subj;
1319a1f7e5f8SHajimu UMEMOTO 			if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj))
1320686cdd19SJun-ichiro itojun Hagino 				break;
132133841545SHajimu UMEMOTO 
1322686cdd19SJun-ichiro itojun Hagino 			/*
1323686cdd19SJun-ichiro itojun Hagino 			 * XXX if we are to allow other cases, we should really
1324686cdd19SJun-ichiro itojun Hagino 			 * be careful about scope here.
1325686cdd19SJun-ichiro itojun Hagino 			 * basically, we should disallow queries toward IPv6
132606cd0a3fSHajimu UMEMOTO 			 * destination X with subject Y,
132706cd0a3fSHajimu UMEMOTO 			 * if scope(X) > scope(Y).
1328686cdd19SJun-ichiro itojun Hagino 			 * if we allow scope(X) > scope(Y), it will result in
1329686cdd19SJun-ichiro itojun Hagino 			 * information leakage across scope boundary.
1330686cdd19SJun-ichiro itojun Hagino 			 */
1331686cdd19SJun-ichiro itojun Hagino 			goto bad;
1332686cdd19SJun-ichiro itojun Hagino 
1333686cdd19SJun-ichiro itojun Hagino 		case ICMP6_NI_SUBJ_FQDN:
1334686cdd19SJun-ichiro itojun Hagino 			/*
1335686cdd19SJun-ichiro itojun Hagino 			 * Validate Subject name with gethostname(3).
1336686cdd19SJun-ichiro itojun Hagino 			 *
1337686cdd19SJun-ichiro itojun Hagino 			 * The behavior may need some debate, since:
1338686cdd19SJun-ichiro itojun Hagino 			 * - we are not sure if the node has FQDN as
1339686cdd19SJun-ichiro itojun Hagino 			 *   hostname (returned by gethostname(3)).
1340686cdd19SJun-ichiro itojun Hagino 			 * - the code does wildcard match for truncated names.
1341686cdd19SJun-ichiro itojun Hagino 			 *   however, we are not sure if we want to perform
1342686cdd19SJun-ichiro itojun Hagino 			 *   wildcard match, if gethostname(3) side has
1343686cdd19SJun-ichiro itojun Hagino 			 *   truncated hostname.
1344686cdd19SJun-ichiro itojun Hagino 			 */
134576ca6f88SJamie Gritton 			mtx_lock(&pr->pr_mtx);
1346c1f19219SJamie Gritton 			n = ni6_nametodns(pr->pr_hostname,
1347c1f19219SJamie Gritton 			    strlen(pr->pr_hostname), 0);
134876ca6f88SJamie Gritton 			mtx_unlock(&pr->pr_mtx);
1349686cdd19SJun-ichiro itojun Hagino 			if (!n || n->m_next || n->m_len == 0)
1350686cdd19SJun-ichiro itojun Hagino 				goto bad;
1351a4adf6ccSBjoern A. Zeeb 			if (m->m_len < off + sizeof(struct icmp6_nodeinfo) +
1352a4adf6ccSBjoern A. Zeeb 			    subjlen) {
1353a4adf6ccSBjoern A. Zeeb 				m = m_pullup(m, off +
1354a4adf6ccSBjoern A. Zeeb 				    sizeof(struct icmp6_nodeinfo) + subjlen);
1355a61b5cfbSBjoern A. Zeeb 				if (m == NULL) {
1356a61b5cfbSBjoern A. Zeeb 					IP6STAT_INC(ip6s_exthdrtoolong);
1357686cdd19SJun-ichiro itojun Hagino 					goto bad;
1358a61b5cfbSBjoern A. Zeeb 				}
1359a4adf6ccSBjoern A. Zeeb 			}
1360a61b5cfbSBjoern A. Zeeb 			/* ip6 possibly invalid but not used after. */
1361a61b5cfbSBjoern A. Zeeb 			ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1362a61b5cfbSBjoern A. Zeeb 			subj = (char *)(mtod(m, caddr_t) + off +
1363a61b5cfbSBjoern A. Zeeb 			    sizeof(struct icmp6_nodeinfo));
1364686cdd19SJun-ichiro itojun Hagino 			if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1365686cdd19SJun-ichiro itojun Hagino 			    n->m_len)) {
1366686cdd19SJun-ichiro itojun Hagino 				goto bad;
1367686cdd19SJun-ichiro itojun Hagino 			}
1368686cdd19SJun-ichiro itojun Hagino 			m_freem(n);
1369686cdd19SJun-ichiro itojun Hagino 			n = NULL;
1370686cdd19SJun-ichiro itojun Hagino 			break;
1371686cdd19SJun-ichiro itojun Hagino 
137233841545SHajimu UMEMOTO 		case ICMP6_NI_SUBJ_IPV4:	/* XXX: to be implemented? */
1373686cdd19SJun-ichiro itojun Hagino 		default:
1374686cdd19SJun-ichiro itojun Hagino 			goto bad;
1375686cdd19SJun-ichiro itojun Hagino 		}
1376686cdd19SJun-ichiro itojun Hagino 		break;
1377686cdd19SJun-ichiro itojun Hagino 	}
1378686cdd19SJun-ichiro itojun Hagino 
137933841545SHajimu UMEMOTO 	/* refuse based on configuration.  XXX ICMP6_NI_REFUSED? */
138033841545SHajimu UMEMOTO 	switch (qtype) {
138133841545SHajimu UMEMOTO 	case NI_QTYPE_FQDN:
1382603724d3SBjoern A. Zeeb 		if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0)
138333841545SHajimu UMEMOTO 			goto bad;
138433841545SHajimu UMEMOTO 		break;
138533841545SHajimu UMEMOTO 	case NI_QTYPE_NODEADDR:
1386a22adbc6SSUZUKI Shinsuke 	case NI_QTYPE_IPV4ADDR:
1387603724d3SBjoern A. Zeeb 		if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0)
138833841545SHajimu UMEMOTO 			goto bad;
138933841545SHajimu UMEMOTO 		break;
139033841545SHajimu UMEMOTO 	}
139133841545SHajimu UMEMOTO 
139233841545SHajimu UMEMOTO 	/* guess reply length */
139333841545SHajimu UMEMOTO 	switch (qtype) {
139433841545SHajimu UMEMOTO 	case NI_QTYPE_NOOP:
139533841545SHajimu UMEMOTO 		break;		/* no reply data */
139633841545SHajimu UMEMOTO 	case NI_QTYPE_SUPTYPES:
139733841545SHajimu UMEMOTO 		replylen += sizeof(u_int32_t);
139833841545SHajimu UMEMOTO 		break;
139933841545SHajimu UMEMOTO 	case NI_QTYPE_FQDN:
140033841545SHajimu UMEMOTO 		/* XXX will append an mbuf */
140133841545SHajimu UMEMOTO 		replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
140233841545SHajimu UMEMOTO 		break;
140333841545SHajimu UMEMOTO 	case NI_QTYPE_NODEADDR:
1404c66b5feaSHajimu UMEMOTO 		addrs = ni6_addrs(ni6, m, &ifp, (struct in6_addr *)subj);
140533841545SHajimu UMEMOTO 		if ((replylen += addrs * (sizeof(struct in6_addr) +
140633841545SHajimu UMEMOTO 		    sizeof(u_int32_t))) > MCLBYTES)
140733841545SHajimu UMEMOTO 			replylen = MCLBYTES; /* XXX: will truncate pkt later */
140833841545SHajimu UMEMOTO 		break;
1409a22adbc6SSUZUKI Shinsuke 	case NI_QTYPE_IPV4ADDR:
1410a22adbc6SSUZUKI Shinsuke 		/* unsupported - should respond with unknown Qtype? */
1411a22adbc6SSUZUKI Shinsuke 		break;
141233841545SHajimu UMEMOTO 	default:
141333841545SHajimu UMEMOTO 		/*
141433841545SHajimu UMEMOTO 		 * XXX: We must return a reply with the ICMP6 code
141533841545SHajimu UMEMOTO 		 * `unknown Qtype' in this case.  However we regard the case
141633841545SHajimu UMEMOTO 		 * as an FQDN query for backward compatibility.
141733841545SHajimu UMEMOTO 		 * Older versions set a random value to this field,
141833841545SHajimu UMEMOTO 		 * so it rarely varies in the defined qtypes.
141933841545SHajimu UMEMOTO 		 * But the mechanism is not reliable...
142033841545SHajimu UMEMOTO 		 * maybe we should obsolete older versions.
142133841545SHajimu UMEMOTO 		 */
142233841545SHajimu UMEMOTO 		qtype = NI_QTYPE_FQDN;
142333841545SHajimu UMEMOTO 		/* XXX will append an mbuf */
142433841545SHajimu UMEMOTO 		replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
142533841545SHajimu UMEMOTO 		oldfqdn++;
142633841545SHajimu UMEMOTO 		break;
142733841545SHajimu UMEMOTO 	}
142833841545SHajimu UMEMOTO 
142910e5acc3SGleb Smirnoff 	/* Allocate an mbuf to reply. */
1430686cdd19SJun-ichiro itojun Hagino 	if (replylen > MCLBYTES) {
143182cd038dSYoshinobu Inoue 		/*
143233841545SHajimu UMEMOTO 		 * XXX: should we try to allocate more? But MCLBYTES
143333841545SHajimu UMEMOTO 		 * is probably much larger than IPV6_MMTU...
143482cd038dSYoshinobu Inoue 		 */
143582cd038dSYoshinobu Inoue 		goto bad;
1436686cdd19SJun-ichiro itojun Hagino 	}
143710e5acc3SGleb Smirnoff 	if (replylen > MHLEN)
143810e5acc3SGleb Smirnoff 		n = m_getcl(M_NOWAIT, m->m_type, M_PKTHDR);
143910e5acc3SGleb Smirnoff 	else
144010e5acc3SGleb Smirnoff 		n = m_gethdr(M_NOWAIT, m->m_type);
144110e5acc3SGleb Smirnoff 	if (n == NULL) {
144210e5acc3SGleb Smirnoff 		m_freem(m);
144310e5acc3SGleb Smirnoff 		return (NULL);
144482cd038dSYoshinobu Inoue 	}
144510e5acc3SGleb Smirnoff 	m_move_pkthdr(n, m); /* just for recvif and FIB */
144682cd038dSYoshinobu Inoue 	n->m_pkthdr.len = n->m_len = replylen;
144782cd038dSYoshinobu Inoue 
144882cd038dSYoshinobu Inoue 	/* copy mbuf header and IPv6 + Node Information base headers */
144982cd038dSYoshinobu Inoue 	bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
145082cd038dSYoshinobu Inoue 	nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1451686cdd19SJun-ichiro itojun Hagino 	bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
145282cd038dSYoshinobu Inoue 
145382cd038dSYoshinobu Inoue 	/* qtype dependent procedure */
145482cd038dSYoshinobu Inoue 	switch (qtype) {
145582cd038dSYoshinobu Inoue 	case NI_QTYPE_NOOP:
145633841545SHajimu UMEMOTO 		nni6->ni_code = ICMP6_NI_SUCCESS;
145782cd038dSYoshinobu Inoue 		nni6->ni_flags = 0;
145882cd038dSYoshinobu Inoue 		break;
145982cd038dSYoshinobu Inoue 	case NI_QTYPE_SUPTYPES:
146033841545SHajimu UMEMOTO 	{
146133841545SHajimu UMEMOTO 		u_int32_t v;
146233841545SHajimu UMEMOTO 		nni6->ni_code = ICMP6_NI_SUCCESS;
146333841545SHajimu UMEMOTO 		nni6->ni_flags = htons(0x0000);	/* raw bitmap */
146433841545SHajimu UMEMOTO 		/* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
146533841545SHajimu UMEMOTO 		v = (u_int32_t)htonl(0x0000000f);
146633841545SHajimu UMEMOTO 		bcopy(&v, nni6 + 1, sizeof(u_int32_t));
146782cd038dSYoshinobu Inoue 		break;
146833841545SHajimu UMEMOTO 	}
146982cd038dSYoshinobu Inoue 	case NI_QTYPE_FQDN:
147033841545SHajimu UMEMOTO 		nni6->ni_code = ICMP6_NI_SUCCESS;
147182cd038dSYoshinobu Inoue 		fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
147206cd0a3fSHajimu UMEMOTO 		    sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo));
147382cd038dSYoshinobu Inoue 		nni6->ni_flags = 0; /* XXX: meaningless TTL */
147482cd038dSYoshinobu Inoue 		fqdn->ni_fqdn_ttl = 0;	/* ditto. */
1475686cdd19SJun-ichiro itojun Hagino 		/*
147676ca6f88SJamie Gritton 		 * XXX do we really have FQDN in hostname?
1477686cdd19SJun-ichiro itojun Hagino 		 */
147876ca6f88SJamie Gritton 		mtx_lock(&pr->pr_mtx);
1479c1f19219SJamie Gritton 		n->m_next = ni6_nametodns(pr->pr_hostname,
1480c1f19219SJamie Gritton 		    strlen(pr->pr_hostname), oldfqdn);
148176ca6f88SJamie Gritton 		mtx_unlock(&pr->pr_mtx);
1482686cdd19SJun-ichiro itojun Hagino 		if (n->m_next == NULL)
1483686cdd19SJun-ichiro itojun Hagino 			goto bad;
1484686cdd19SJun-ichiro itojun Hagino 		/* XXX we assume that n->m_next is not a chain */
1485686cdd19SJun-ichiro itojun Hagino 		if (n->m_next->m_next != NULL)
1486686cdd19SJun-ichiro itojun Hagino 			goto bad;
1487686cdd19SJun-ichiro itojun Hagino 		n->m_pkthdr.len += n->m_next->m_len;
148882cd038dSYoshinobu Inoue 		break;
148982cd038dSYoshinobu Inoue 	case NI_QTYPE_NODEADDR:
149082cd038dSYoshinobu Inoue 	{
149182cd038dSYoshinobu Inoue 		int lenlim, copied;
149282cd038dSYoshinobu Inoue 
149333841545SHajimu UMEMOTO 		nni6->ni_code = ICMP6_NI_SUCCESS;
149433841545SHajimu UMEMOTO 		n->m_pkthdr.len = n->m_len =
149533841545SHajimu UMEMOTO 		    sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
149633841545SHajimu UMEMOTO 		lenlim = M_TRAILINGSPACE(n);
149782cd038dSYoshinobu Inoue 		copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
149882cd038dSYoshinobu Inoue 		/* XXX: reset mbuf length */
149982cd038dSYoshinobu Inoue 		n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
150082cd038dSYoshinobu Inoue 		    sizeof(struct icmp6_nodeinfo) + copied;
150182cd038dSYoshinobu Inoue 		break;
150282cd038dSYoshinobu Inoue 	}
150382cd038dSYoshinobu Inoue 	default:
150482cd038dSYoshinobu Inoue 		break;		/* XXX impossible! */
150582cd038dSYoshinobu Inoue 	}
150682cd038dSYoshinobu Inoue 
150782cd038dSYoshinobu Inoue 	nni6->ni_type = ICMP6_NI_REPLY;
1508686cdd19SJun-ichiro itojun Hagino 	m_freem(m);
150982cd038dSYoshinobu Inoue 	return (n);
151082cd038dSYoshinobu Inoue 
151182cd038dSYoshinobu Inoue   bad:
1512686cdd19SJun-ichiro itojun Hagino 	m_freem(m);
151382cd038dSYoshinobu Inoue 	if (n)
151482cd038dSYoshinobu Inoue 		m_freem(n);
151582cd038dSYoshinobu Inoue 	return (NULL);
151682cd038dSYoshinobu Inoue }
151782cd038dSYoshinobu Inoue 
151882cd038dSYoshinobu Inoue /*
1519686cdd19SJun-ichiro itojun Hagino  * make a mbuf with DNS-encoded string.  no compression support.
1520686cdd19SJun-ichiro itojun Hagino  *
1521686cdd19SJun-ichiro itojun Hagino  * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1522686cdd19SJun-ichiro itojun Hagino  * treated as truncated name (two \0 at the end).  this is a wild guess.
15231272577eSXin LI  *
15241272577eSXin LI  * old - return pascal string if non-zero
1525686cdd19SJun-ichiro itojun Hagino  */
1526686cdd19SJun-ichiro itojun Hagino static struct mbuf *
15271272577eSXin LI ni6_nametodns(const char *name, int namelen, int old)
1528686cdd19SJun-ichiro itojun Hagino {
1529686cdd19SJun-ichiro itojun Hagino 	struct mbuf *m;
1530686cdd19SJun-ichiro itojun Hagino 	char *cp, *ep;
1531686cdd19SJun-ichiro itojun Hagino 	const char *p, *q;
1532686cdd19SJun-ichiro itojun Hagino 	int i, len, nterm;
1533686cdd19SJun-ichiro itojun Hagino 
1534686cdd19SJun-ichiro itojun Hagino 	if (old)
1535686cdd19SJun-ichiro itojun Hagino 		len = namelen + 1;
1536686cdd19SJun-ichiro itojun Hagino 	else
1537686cdd19SJun-ichiro itojun Hagino 		len = MCLBYTES;
1538686cdd19SJun-ichiro itojun Hagino 
15397b07d1beSGleb Smirnoff 	/* Because MAXHOSTNAMELEN is usually 256, we use cluster mbuf. */
15407b07d1beSGleb Smirnoff 	if (len > MLEN)
15417b07d1beSGleb Smirnoff 		m = m_getcl(M_NOWAIT, MT_DATA, 0);
15427b07d1beSGleb Smirnoff 	else
15437b07d1beSGleb Smirnoff 		m = m_get(M_NOWAIT, MT_DATA);
15447b07d1beSGleb Smirnoff 	if (m == NULL)
1545686cdd19SJun-ichiro itojun Hagino 		goto fail;
1546686cdd19SJun-ichiro itojun Hagino 
1547686cdd19SJun-ichiro itojun Hagino 	if (old) {
1548686cdd19SJun-ichiro itojun Hagino 		m->m_len = len;
1549686cdd19SJun-ichiro itojun Hagino 		*mtod(m, char *) = namelen;
1550686cdd19SJun-ichiro itojun Hagino 		bcopy(name, mtod(m, char *) + 1, namelen);
1551686cdd19SJun-ichiro itojun Hagino 		return m;
1552686cdd19SJun-ichiro itojun Hagino 	} else {
1553686cdd19SJun-ichiro itojun Hagino 		m->m_len = 0;
1554686cdd19SJun-ichiro itojun Hagino 		cp = mtod(m, char *);
1555686cdd19SJun-ichiro itojun Hagino 		ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1556686cdd19SJun-ichiro itojun Hagino 
1557686cdd19SJun-ichiro itojun Hagino 		/* if not certain about my name, return empty buffer */
1558686cdd19SJun-ichiro itojun Hagino 		if (namelen == 0)
1559686cdd19SJun-ichiro itojun Hagino 			return m;
1560686cdd19SJun-ichiro itojun Hagino 
1561686cdd19SJun-ichiro itojun Hagino 		/*
1562686cdd19SJun-ichiro itojun Hagino 		 * guess if it looks like shortened hostname, or FQDN.
1563686cdd19SJun-ichiro itojun Hagino 		 * shortened hostname needs two trailing "\0".
1564686cdd19SJun-ichiro itojun Hagino 		 */
1565686cdd19SJun-ichiro itojun Hagino 		i = 0;
1566686cdd19SJun-ichiro itojun Hagino 		for (p = name; p < name + namelen; p++) {
1567686cdd19SJun-ichiro itojun Hagino 			if (*p && *p == '.')
1568686cdd19SJun-ichiro itojun Hagino 				i++;
1569686cdd19SJun-ichiro itojun Hagino 		}
1570686cdd19SJun-ichiro itojun Hagino 		if (i < 2)
1571686cdd19SJun-ichiro itojun Hagino 			nterm = 2;
1572686cdd19SJun-ichiro itojun Hagino 		else
1573686cdd19SJun-ichiro itojun Hagino 			nterm = 1;
1574686cdd19SJun-ichiro itojun Hagino 
1575686cdd19SJun-ichiro itojun Hagino 		p = name;
1576686cdd19SJun-ichiro itojun Hagino 		while (cp < ep && p < name + namelen) {
1577686cdd19SJun-ichiro itojun Hagino 			i = 0;
1578686cdd19SJun-ichiro itojun Hagino 			for (q = p; q < name + namelen && *q && *q != '.'; q++)
1579686cdd19SJun-ichiro itojun Hagino 				i++;
1580686cdd19SJun-ichiro itojun Hagino 			/* result does not fit into mbuf */
1581686cdd19SJun-ichiro itojun Hagino 			if (cp + i + 1 >= ep)
1582686cdd19SJun-ichiro itojun Hagino 				goto fail;
1583610be6ceSHajimu UMEMOTO 			/*
1584610be6ceSHajimu UMEMOTO 			 * DNS label length restriction, RFC1035 page 8.
1585610be6ceSHajimu UMEMOTO 			 * "i == 0" case is included here to avoid returning
1586610be6ceSHajimu UMEMOTO 			 * 0-length label on "foo..bar".
1587610be6ceSHajimu UMEMOTO 			 */
1588610be6ceSHajimu UMEMOTO 			if (i <= 0 || i >= 64)
1589686cdd19SJun-ichiro itojun Hagino 				goto fail;
1590686cdd19SJun-ichiro itojun Hagino 			*cp++ = i;
1591686cdd19SJun-ichiro itojun Hagino 			bcopy(p, cp, i);
1592686cdd19SJun-ichiro itojun Hagino 			cp += i;
1593686cdd19SJun-ichiro itojun Hagino 			p = q;
1594686cdd19SJun-ichiro itojun Hagino 			if (p < name + namelen && *p == '.')
1595686cdd19SJun-ichiro itojun Hagino 				p++;
1596686cdd19SJun-ichiro itojun Hagino 		}
1597686cdd19SJun-ichiro itojun Hagino 		/* termination */
1598686cdd19SJun-ichiro itojun Hagino 		if (cp + nterm >= ep)
1599686cdd19SJun-ichiro itojun Hagino 			goto fail;
1600686cdd19SJun-ichiro itojun Hagino 		while (nterm-- > 0)
1601686cdd19SJun-ichiro itojun Hagino 			*cp++ = '\0';
1602686cdd19SJun-ichiro itojun Hagino 		m->m_len = cp - mtod(m, char *);
1603686cdd19SJun-ichiro itojun Hagino 		return m;
1604686cdd19SJun-ichiro itojun Hagino 	}
1605686cdd19SJun-ichiro itojun Hagino 
1606686cdd19SJun-ichiro itojun Hagino 	panic("should not reach here");
1607686cdd19SJun-ichiro itojun Hagino 	/* NOTREACHED */
1608686cdd19SJun-ichiro itojun Hagino 
1609686cdd19SJun-ichiro itojun Hagino  fail:
1610686cdd19SJun-ichiro itojun Hagino 	if (m)
1611686cdd19SJun-ichiro itojun Hagino 		m_freem(m);
1612686cdd19SJun-ichiro itojun Hagino 	return NULL;
1613686cdd19SJun-ichiro itojun Hagino }
1614686cdd19SJun-ichiro itojun Hagino 
1615686cdd19SJun-ichiro itojun Hagino /*
1616686cdd19SJun-ichiro itojun Hagino  * check if two DNS-encoded string matches.  takes care of truncated
1617686cdd19SJun-ichiro itojun Hagino  * form (with \0\0 at the end).  no compression support.
161833841545SHajimu UMEMOTO  * XXX upper/lowercase match (see RFC2065)
1619686cdd19SJun-ichiro itojun Hagino  */
1620686cdd19SJun-ichiro itojun Hagino static int
16211272577eSXin LI ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
1622686cdd19SJun-ichiro itojun Hagino {
1623686cdd19SJun-ichiro itojun Hagino 	const char *a0, *b0;
1624686cdd19SJun-ichiro itojun Hagino 	int l;
1625686cdd19SJun-ichiro itojun Hagino 
1626686cdd19SJun-ichiro itojun Hagino 	/* simplest case - need validation? */
1627686cdd19SJun-ichiro itojun Hagino 	if (alen == blen && bcmp(a, b, alen) == 0)
1628686cdd19SJun-ichiro itojun Hagino 		return 1;
1629686cdd19SJun-ichiro itojun Hagino 
1630686cdd19SJun-ichiro itojun Hagino 	a0 = a;
1631686cdd19SJun-ichiro itojun Hagino 	b0 = b;
1632686cdd19SJun-ichiro itojun Hagino 
1633686cdd19SJun-ichiro itojun Hagino 	/* termination is mandatory */
1634686cdd19SJun-ichiro itojun Hagino 	if (alen < 2 || blen < 2)
1635686cdd19SJun-ichiro itojun Hagino 		return 0;
1636686cdd19SJun-ichiro itojun Hagino 	if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1637686cdd19SJun-ichiro itojun Hagino 		return 0;
1638686cdd19SJun-ichiro itojun Hagino 	alen--;
1639686cdd19SJun-ichiro itojun Hagino 	blen--;
1640686cdd19SJun-ichiro itojun Hagino 
1641686cdd19SJun-ichiro itojun Hagino 	while (a - a0 < alen && b - b0 < blen) {
1642686cdd19SJun-ichiro itojun Hagino 		if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1643686cdd19SJun-ichiro itojun Hagino 			return 0;
1644686cdd19SJun-ichiro itojun Hagino 
1645686cdd19SJun-ichiro itojun Hagino 		if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1646686cdd19SJun-ichiro itojun Hagino 			return 0;
1647686cdd19SJun-ichiro itojun Hagino 		/* we don't support compression yet */
1648686cdd19SJun-ichiro itojun Hagino 		if (a[0] >= 64 || b[0] >= 64)
1649686cdd19SJun-ichiro itojun Hagino 			return 0;
1650686cdd19SJun-ichiro itojun Hagino 
1651686cdd19SJun-ichiro itojun Hagino 		/* truncated case */
1652686cdd19SJun-ichiro itojun Hagino 		if (a[0] == 0 && a - a0 == alen - 1)
1653686cdd19SJun-ichiro itojun Hagino 			return 1;
1654686cdd19SJun-ichiro itojun Hagino 		if (b[0] == 0 && b - b0 == blen - 1)
1655686cdd19SJun-ichiro itojun Hagino 			return 1;
1656686cdd19SJun-ichiro itojun Hagino 		if (a[0] == 0 || b[0] == 0)
1657686cdd19SJun-ichiro itojun Hagino 			return 0;
1658686cdd19SJun-ichiro itojun Hagino 
1659686cdd19SJun-ichiro itojun Hagino 		if (a[0] != b[0])
1660686cdd19SJun-ichiro itojun Hagino 			return 0;
1661686cdd19SJun-ichiro itojun Hagino 		l = a[0];
1662686cdd19SJun-ichiro itojun Hagino 		if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1663686cdd19SJun-ichiro itojun Hagino 			return 0;
1664686cdd19SJun-ichiro itojun Hagino 		if (bcmp(a + 1, b + 1, l) != 0)
1665686cdd19SJun-ichiro itojun Hagino 			return 0;
1666686cdd19SJun-ichiro itojun Hagino 
1667686cdd19SJun-ichiro itojun Hagino 		a += 1 + l;
1668686cdd19SJun-ichiro itojun Hagino 		b += 1 + l;
1669686cdd19SJun-ichiro itojun Hagino 	}
1670686cdd19SJun-ichiro itojun Hagino 
1671686cdd19SJun-ichiro itojun Hagino 	if (a - a0 == alen && b - b0 == blen)
1672686cdd19SJun-ichiro itojun Hagino 		return 1;
1673686cdd19SJun-ichiro itojun Hagino 	else
1674686cdd19SJun-ichiro itojun Hagino 		return 0;
1675686cdd19SJun-ichiro itojun Hagino }
1676686cdd19SJun-ichiro itojun Hagino 
1677686cdd19SJun-ichiro itojun Hagino /*
167882cd038dSYoshinobu Inoue  * calculate the number of addresses to be returned in the node info reply.
167982cd038dSYoshinobu Inoue  */
168082cd038dSYoshinobu Inoue static int
16811272577eSXin LI ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp,
16821272577eSXin LI     struct in6_addr *subj)
168382cd038dSYoshinobu Inoue {
168433841545SHajimu UMEMOTO 	struct ifnet *ifp;
168533841545SHajimu UMEMOTO 	struct in6_ifaddr *ifa6;
168633841545SHajimu UMEMOTO 	struct ifaddr *ifa;
168782cd038dSYoshinobu Inoue 	int addrs = 0, addrsofif, iffound = 0;
168833841545SHajimu UMEMOTO 	int niflags = ni6->ni_flags;
168933841545SHajimu UMEMOTO 
1690b8a6e03fSGleb Smirnoff 	NET_EPOCH_ASSERT();
1691b8a6e03fSGleb Smirnoff 
169233841545SHajimu UMEMOTO 	if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
169333841545SHajimu UMEMOTO 		switch (ni6->ni_code) {
169433841545SHajimu UMEMOTO 		case ICMP6_NI_SUBJ_IPV6:
169533841545SHajimu UMEMOTO 			if (subj == NULL) /* must be impossible... */
169633841545SHajimu UMEMOTO 				return (0);
169733841545SHajimu UMEMOTO 			break;
169833841545SHajimu UMEMOTO 		default:
169933841545SHajimu UMEMOTO 			/*
170033841545SHajimu UMEMOTO 			 * XXX: we only support IPv6 subject address for
170133841545SHajimu UMEMOTO 			 * this Qtype.
170233841545SHajimu UMEMOTO 			 */
170333841545SHajimu UMEMOTO 			return (0);
170433841545SHajimu UMEMOTO 		}
170533841545SHajimu UMEMOTO 	}
170682cd038dSYoshinobu Inoue 
17074f6c66ccSMatt Macy 	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
170882cd038dSYoshinobu Inoue 		addrsofif = 0;
1709d7c5a620SMatt Macy 		CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
171082cd038dSYoshinobu Inoue 			if (ifa->ifa_addr->sa_family != AF_INET6)
171182cd038dSYoshinobu Inoue 				continue;
171282cd038dSYoshinobu Inoue 			ifa6 = (struct in6_ifaddr *)ifa;
171382cd038dSYoshinobu Inoue 
171433841545SHajimu UMEMOTO 			if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1715c66b5feaSHajimu UMEMOTO 			    IN6_ARE_ADDR_EQUAL(subj, &ifa6->ia_addr.sin6_addr))
171682cd038dSYoshinobu Inoue 				iffound = 1;
171782cd038dSYoshinobu Inoue 
1718686cdd19SJun-ichiro itojun Hagino 			/*
1719686cdd19SJun-ichiro itojun Hagino 			 * IPv4-mapped addresses can only be returned by a
1720686cdd19SJun-ichiro itojun Hagino 			 * Node Information proxy, since they represent
1721686cdd19SJun-ichiro itojun Hagino 			 * addresses of IPv4-only nodes, which perforce do
1722686cdd19SJun-ichiro itojun Hagino 			 * not implement this protocol.
172333841545SHajimu UMEMOTO 			 * [icmp-name-lookups-07, Section 5.4]
1724686cdd19SJun-ichiro itojun Hagino 			 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1725686cdd19SJun-ichiro itojun Hagino 			 * this function at this moment.
1726686cdd19SJun-ichiro itojun Hagino 			 */
1727686cdd19SJun-ichiro itojun Hagino 
172882cd038dSYoshinobu Inoue 			/* What do we have to do about ::1? */
172982cd038dSYoshinobu Inoue 			switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
173082cd038dSYoshinobu Inoue 			case IPV6_ADDR_SCOPE_LINKLOCAL:
173133841545SHajimu UMEMOTO 				if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
173233841545SHajimu UMEMOTO 					continue;
173382cd038dSYoshinobu Inoue 				break;
173482cd038dSYoshinobu Inoue 			case IPV6_ADDR_SCOPE_SITELOCAL:
173533841545SHajimu UMEMOTO 				if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
173633841545SHajimu UMEMOTO 					continue;
173782cd038dSYoshinobu Inoue 				break;
173882cd038dSYoshinobu Inoue 			case IPV6_ADDR_SCOPE_GLOBAL:
173933841545SHajimu UMEMOTO 				if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
174033841545SHajimu UMEMOTO 					continue;
174182cd038dSYoshinobu Inoue 				break;
174282cd038dSYoshinobu Inoue 			default:
174382cd038dSYoshinobu Inoue 				continue;
174482cd038dSYoshinobu Inoue 			}
174533841545SHajimu UMEMOTO 
174633841545SHajimu UMEMOTO 			/*
174733841545SHajimu UMEMOTO 			 * check if anycast is okay.
174833841545SHajimu UMEMOTO 			 * XXX: just experimental.  not in the spec.
174933841545SHajimu UMEMOTO 			 */
175033841545SHajimu UMEMOTO 			if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
175133841545SHajimu UMEMOTO 			    (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
175233841545SHajimu UMEMOTO 				continue; /* we need only unicast addresses */
175333841545SHajimu UMEMOTO 			if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1754603724d3SBjoern A. Zeeb 			    (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
175533841545SHajimu UMEMOTO 				continue;
175633841545SHajimu UMEMOTO 			}
175733841545SHajimu UMEMOTO 			addrsofif++; /* count the address */
175882cd038dSYoshinobu Inoue 		}
175982cd038dSYoshinobu Inoue 		if (iffound) {
176082cd038dSYoshinobu Inoue 			*ifpp = ifp;
176182cd038dSYoshinobu Inoue 			return (addrsofif);
176282cd038dSYoshinobu Inoue 		}
176382cd038dSYoshinobu Inoue 
176482cd038dSYoshinobu Inoue 		addrs += addrsofif;
176582cd038dSYoshinobu Inoue 	}
176682cd038dSYoshinobu Inoue 
176782cd038dSYoshinobu Inoue 	return (addrs);
176882cd038dSYoshinobu Inoue }
176982cd038dSYoshinobu Inoue 
177082cd038dSYoshinobu Inoue static int
17711272577eSXin LI ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6,
17721272577eSXin LI     struct ifnet *ifp0, int resid)
177382cd038dSYoshinobu Inoue {
177494e83133SJohn Baldwin 	struct ifnet *ifp;
177533841545SHajimu UMEMOTO 	struct in6_ifaddr *ifa6;
177633841545SHajimu UMEMOTO 	struct ifaddr *ifa;
177733841545SHajimu UMEMOTO 	struct ifnet *ifp_dep = NULL;
177833841545SHajimu UMEMOTO 	int copied = 0, allow_deprecated = 0;
177982cd038dSYoshinobu Inoue 	u_char *cp = (u_char *)(nni6 + 1);
178033841545SHajimu UMEMOTO 	int niflags = ni6->ni_flags;
178133841545SHajimu UMEMOTO 	u_int32_t ltime;
178282cd038dSYoshinobu Inoue 
1783b8a6e03fSGleb Smirnoff 	NET_EPOCH_ASSERT();
1784b8a6e03fSGleb Smirnoff 
178533841545SHajimu UMEMOTO 	if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
178682cd038dSYoshinobu Inoue 		return (0);	/* needless to copy */
178782cd038dSYoshinobu Inoue 
17884f6c66ccSMatt Macy 	ifp = ifp0 ? ifp0 : CK_STAILQ_FIRST(&V_ifnet);
178933841545SHajimu UMEMOTO   again:
17900527d333SHajimu UMEMOTO 
17914f6c66ccSMatt Macy 	for (; ifp; ifp = CK_STAILQ_NEXT(ifp, if_link)) {
1792d7c5a620SMatt Macy 		CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
179382cd038dSYoshinobu Inoue 			if (ifa->ifa_addr->sa_family != AF_INET6)
179482cd038dSYoshinobu Inoue 				continue;
179582cd038dSYoshinobu Inoue 			ifa6 = (struct in6_ifaddr *)ifa;
179682cd038dSYoshinobu Inoue 
179733841545SHajimu UMEMOTO 			if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
179833841545SHajimu UMEMOTO 			    allow_deprecated == 0) {
179933841545SHajimu UMEMOTO 				/*
180033841545SHajimu UMEMOTO 				 * prefererred address should be put before
180133841545SHajimu UMEMOTO 				 * deprecated addresses.
180233841545SHajimu UMEMOTO 				 */
180333841545SHajimu UMEMOTO 
180433841545SHajimu UMEMOTO 				/* record the interface for later search */
180533841545SHajimu UMEMOTO 				if (ifp_dep == NULL)
180633841545SHajimu UMEMOTO 					ifp_dep = ifp;
180733841545SHajimu UMEMOTO 
180882cd038dSYoshinobu Inoue 				continue;
180906cd0a3fSHajimu UMEMOTO 			} else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
181033841545SHajimu UMEMOTO 			    allow_deprecated != 0)
181133841545SHajimu UMEMOTO 				continue; /* we now collect deprecated addrs */
181282cd038dSYoshinobu Inoue 
181382cd038dSYoshinobu Inoue 			/* What do we have to do about ::1? */
181482cd038dSYoshinobu Inoue 			switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
181582cd038dSYoshinobu Inoue 			case IPV6_ADDR_SCOPE_LINKLOCAL:
181633841545SHajimu UMEMOTO 				if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
181733841545SHajimu UMEMOTO 					continue;
181882cd038dSYoshinobu Inoue 				break;
181982cd038dSYoshinobu Inoue 			case IPV6_ADDR_SCOPE_SITELOCAL:
182033841545SHajimu UMEMOTO 				if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
182133841545SHajimu UMEMOTO 					continue;
182282cd038dSYoshinobu Inoue 				break;
182382cd038dSYoshinobu Inoue 			case IPV6_ADDR_SCOPE_GLOBAL:
182433841545SHajimu UMEMOTO 				if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
182533841545SHajimu UMEMOTO 					continue;
182682cd038dSYoshinobu Inoue 				break;
182782cd038dSYoshinobu Inoue 			default:
182882cd038dSYoshinobu Inoue 				continue;
182982cd038dSYoshinobu Inoue 			}
183082cd038dSYoshinobu Inoue 
183133841545SHajimu UMEMOTO 			/*
183233841545SHajimu UMEMOTO 			 * check if anycast is okay.
183333841545SHajimu UMEMOTO 			 * XXX: just experimental.  not in the spec.
183433841545SHajimu UMEMOTO 			 */
183533841545SHajimu UMEMOTO 			if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
183633841545SHajimu UMEMOTO 			    (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
183733841545SHajimu UMEMOTO 				continue;
183833841545SHajimu UMEMOTO 			if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1839603724d3SBjoern A. Zeeb 			    (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
184033841545SHajimu UMEMOTO 				continue;
184133841545SHajimu UMEMOTO 			}
184233841545SHajimu UMEMOTO 
184333841545SHajimu UMEMOTO 			/* now we can copy the address */
184433841545SHajimu UMEMOTO 			if (resid < sizeof(struct in6_addr) +
184533841545SHajimu UMEMOTO 			    sizeof(u_int32_t)) {
184682cd038dSYoshinobu Inoue 				/*
184782cd038dSYoshinobu Inoue 				 * We give up much more copy.
184882cd038dSYoshinobu Inoue 				 * Set the truncate flag and return.
184982cd038dSYoshinobu Inoue 				 */
185006cd0a3fSHajimu UMEMOTO 				nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE;
185182cd038dSYoshinobu Inoue 				return (copied);
185282cd038dSYoshinobu Inoue 			}
185333841545SHajimu UMEMOTO 
185433841545SHajimu UMEMOTO 			/*
185533841545SHajimu UMEMOTO 			 * Set the TTL of the address.
185633841545SHajimu UMEMOTO 			 * The TTL value should be one of the following
185733841545SHajimu UMEMOTO 			 * according to the specification:
185833841545SHajimu UMEMOTO 			 *
185933841545SHajimu UMEMOTO 			 * 1. The remaining lifetime of a DHCP lease on the
186033841545SHajimu UMEMOTO 			 *    address, or
186133841545SHajimu UMEMOTO 			 * 2. The remaining Valid Lifetime of a prefix from
186233841545SHajimu UMEMOTO 			 *    which the address was derived through Stateless
186333841545SHajimu UMEMOTO 			 *    Autoconfiguration.
186433841545SHajimu UMEMOTO 			 *
186533841545SHajimu UMEMOTO 			 * Note that we currently do not support stateful
186633841545SHajimu UMEMOTO 			 * address configuration by DHCPv6, so the former
186733841545SHajimu UMEMOTO 			 * case can't happen.
186833841545SHajimu UMEMOTO 			 */
186933841545SHajimu UMEMOTO 			if (ifa6->ia6_lifetime.ia6t_expire == 0)
187033841545SHajimu UMEMOTO 				ltime = ND6_INFINITE_LIFETIME;
187133841545SHajimu UMEMOTO 			else {
187233841545SHajimu UMEMOTO 				if (ifa6->ia6_lifetime.ia6t_expire >
18737d26db17SHiroki Sato 				    time_uptime)
18747d26db17SHiroki Sato 					ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_uptime);
187533841545SHajimu UMEMOTO 				else
187633841545SHajimu UMEMOTO 					ltime = 0;
187733841545SHajimu UMEMOTO 			}
187833841545SHajimu UMEMOTO 
187933841545SHajimu UMEMOTO 			bcopy(&ltime, cp, sizeof(u_int32_t));
188033841545SHajimu UMEMOTO 			cp += sizeof(u_int32_t);
188133841545SHajimu UMEMOTO 
188233841545SHajimu UMEMOTO 			/* copy the address itself */
188382cd038dSYoshinobu Inoue 			bcopy(&ifa6->ia_addr.sin6_addr, cp,
188482cd038dSYoshinobu Inoue 			    sizeof(struct in6_addr));
18859a4f9608SHajimu UMEMOTO 			in6_clearscope((struct in6_addr *)cp); /* XXX */
188682cd038dSYoshinobu Inoue 			cp += sizeof(struct in6_addr);
188733841545SHajimu UMEMOTO 
188833841545SHajimu UMEMOTO 			resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
188906cd0a3fSHajimu UMEMOTO 			copied += (sizeof(struct in6_addr) + sizeof(u_int32_t));
189082cd038dSYoshinobu Inoue 		}
189182cd038dSYoshinobu Inoue 		if (ifp0)	/* we need search only on the specified IF */
189282cd038dSYoshinobu Inoue 			break;
189382cd038dSYoshinobu Inoue 	}
189482cd038dSYoshinobu Inoue 
189533841545SHajimu UMEMOTO 	if (allow_deprecated == 0 && ifp_dep != NULL) {
189633841545SHajimu UMEMOTO 		ifp = ifp_dep;
189733841545SHajimu UMEMOTO 		allow_deprecated = 1;
189833841545SHajimu UMEMOTO 
189933841545SHajimu UMEMOTO 		goto again;
190033841545SHajimu UMEMOTO 	}
190133841545SHajimu UMEMOTO 
190282cd038dSYoshinobu Inoue 	return (copied);
190382cd038dSYoshinobu Inoue }
190482cd038dSYoshinobu Inoue 
1905db0ac6deSCy Schubert static bool
1906db0ac6deSCy Schubert icmp6_rip6_match(const struct inpcb *inp, void *v)
1907db0ac6deSCy Schubert {
1908db0ac6deSCy Schubert 	struct ip6_hdr *ip6 = v;
1909db0ac6deSCy Schubert 
1910db0ac6deSCy Schubert 	if ((inp->inp_vflag & INP_IPV6) == 0)
1911db0ac6deSCy Schubert 		return (false);
1912db0ac6deSCy Schubert 	if (inp->inp_ip_p != IPPROTO_ICMPV6)
1913db0ac6deSCy Schubert 		return (false);
1914db0ac6deSCy Schubert 	if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) &&
1915db0ac6deSCy Schubert 	   !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &ip6->ip6_dst))
1916db0ac6deSCy Schubert 		return (false);
1917db0ac6deSCy Schubert 	if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
1918db0ac6deSCy Schubert 	   !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &ip6->ip6_src))
1919db0ac6deSCy Schubert 		return (false);
1920db0ac6deSCy Schubert 	return (true);
1921db0ac6deSCy Schubert }
1922db0ac6deSCy Schubert 
192382cd038dSYoshinobu Inoue /*
192482cd038dSYoshinobu Inoue  * XXX almost dup'ed code with rip6_input.
192582cd038dSYoshinobu Inoue  */
192682cd038dSYoshinobu Inoue static int
19271272577eSXin LI icmp6_rip6_input(struct mbuf **mp, int off)
192882cd038dSYoshinobu Inoue {
1929db0ac6deSCy Schubert 	struct mbuf *n, *m = *mp;
193033841545SHajimu UMEMOTO 	struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1931db0ac6deSCy Schubert 	struct inpcb_iterator inpi = INP_ITERATOR(&V_ripcbinfo,
1932db0ac6deSCy Schubert 	    INPLOOKUP_RLOCKPCB, icmp6_rip6_match, ip6);
19330ecd976eSBjoern A. Zeeb 	struct inpcb *inp;
19349a4f9608SHajimu UMEMOTO 	struct sockaddr_in6 fromsa;
193582cd038dSYoshinobu Inoue 	struct icmp6_hdr *icmp6;
193682cd038dSYoshinobu Inoue 	struct mbuf *opts = NULL;
1937db0ac6deSCy Schubert 	int delivered = 0;
1938cf377af6SGleb Smirnoff 
1939a61b5cfbSBjoern A. Zeeb 	/* This is assumed to be safe; icmp6_input() does a pullup. */
194082cd038dSYoshinobu Inoue 	icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
194182cd038dSYoshinobu Inoue 
1942a1f7e5f8SHajimu UMEMOTO 	/*
1943a1f7e5f8SHajimu UMEMOTO 	 * XXX: the address may have embedded scope zone ID, which should be
1944a1f7e5f8SHajimu UMEMOTO 	 * hidden from applications.
1945a1f7e5f8SHajimu UMEMOTO 	 */
19469a4f9608SHajimu UMEMOTO 	bzero(&fromsa, sizeof(fromsa));
19479a4f9608SHajimu UMEMOTO 	fromsa.sin6_family = AF_INET6;
1948a1f7e5f8SHajimu UMEMOTO 	fromsa.sin6_len = sizeof(struct sockaddr_in6);
1949a1f7e5f8SHajimu UMEMOTO 	fromsa.sin6_addr = ip6->ip6_src;
1950a1f7e5f8SHajimu UMEMOTO 	if (sa6_recoverscope(&fromsa)) {
1951a1f7e5f8SHajimu UMEMOTO 		m_freem(m);
1952a8fe77d8SBjoern A. Zeeb 		*mp = NULL;
1953a1f7e5f8SHajimu UMEMOTO 		return (IPPROTO_DONE);
1954a1f7e5f8SHajimu UMEMOTO 	}
195582cd038dSYoshinobu Inoue 
1956db0ac6deSCy Schubert 	while ((inp = inp_next(&inpi)) != NULL) {
1957266f97b5SCy Schubert 		if (ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
1958db0ac6deSCy Schubert 		    inp->in6p_icmp6filt))
1959266f97b5SCy Schubert 			continue;
1960657db3c8SHajimu UMEMOTO 		/*
1961657db3c8SHajimu UMEMOTO 		 * Recent network drivers tend to allocate a single
1962657db3c8SHajimu UMEMOTO 		 * mbuf cluster, rather than to make a couple of
1963657db3c8SHajimu UMEMOTO 		 * mbufs without clusters.  Also, since the IPv6 code
1964657db3c8SHajimu UMEMOTO 		 * path tries to avoid m_pullup(), it is highly
1965657db3c8SHajimu UMEMOTO 		 * probable that we still have an mbuf cluster here
1966657db3c8SHajimu UMEMOTO 		 * even though the necessary length can be stored in an
1967657db3c8SHajimu UMEMOTO 		 * mbuf's internal buffer.
1968657db3c8SHajimu UMEMOTO 		 * Meanwhile, the default size of the receive socket
1969657db3c8SHajimu UMEMOTO 		 * buffer for raw sockets is not so large.  This means
1970657db3c8SHajimu UMEMOTO 		 * the possibility of packet loss is relatively higher
1971657db3c8SHajimu UMEMOTO 		 * than before.  To avoid this scenario, we copy the
1972657db3c8SHajimu UMEMOTO 		 * received data to a separate mbuf that does not use
1973657db3c8SHajimu UMEMOTO 		 * a cluster, if possible.
1974657db3c8SHajimu UMEMOTO 		 * XXX: it is better to copy the data after stripping
1975657db3c8SHajimu UMEMOTO 		 * intermediate headers.
1976657db3c8SHajimu UMEMOTO 		 */
1977657db3c8SHajimu UMEMOTO 		if ((m->m_flags & M_EXT) && m->m_next == NULL &&
1978657db3c8SHajimu UMEMOTO 		    m->m_len <= MHLEN) {
19797b07d1beSGleb Smirnoff 			n = m_get(M_NOWAIT, m->m_type);
1980657db3c8SHajimu UMEMOTO 			if (n != NULL) {
1981c543ec4eSGeorge V. Neville-Neil 				if (m_dup_pkthdr(n, m, M_NOWAIT)) {
1982db0ac6deSCy Schubert 					bcopy(m->m_data, n->m_data, m->m_len);
1983657db3c8SHajimu UMEMOTO 					n->m_len = m->m_len;
1984c543ec4eSGeorge V. Neville-Neil 				} else {
1985c543ec4eSGeorge V. Neville-Neil 					m_free(n);
1986c543ec4eSGeorge V. Neville-Neil 					n = NULL;
1987c543ec4eSGeorge V. Neville-Neil 				}
1988657db3c8SHajimu UMEMOTO 			}
1989db0ac6deSCy Schubert 		} else
1990db0ac6deSCy Schubert 			n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
1991db0ac6deSCy Schubert 		if (n == NULL)
1992db0ac6deSCy Schubert 			continue;
1993db0ac6deSCy Schubert 		if (inp->inp_flags & INP_CONTROLOPTS)
1994db0ac6deSCy Schubert 			ip6_savecontrol(inp, n, &opts);
199582cd038dSYoshinobu Inoue 		/* strip intermediate headers */
199682cd038dSYoshinobu Inoue 		m_adj(n, off);
1997db0ac6deSCy Schubert 		SOCKBUF_LOCK(&inp->inp_socket->so_rcv);
1998db0ac6deSCy Schubert 		if (sbappendaddr_locked(&inp->inp_socket->so_rcv,
1999db0ac6deSCy Schubert 		    (struct sockaddr *)&fromsa, n, opts) == 0) {
2000db0ac6deSCy Schubert 			soroverflow_locked(inp->inp_socket);
200182cd038dSYoshinobu Inoue 			m_freem(n);
2002266f97b5SCy Schubert 			if (opts)
2003266f97b5SCy Schubert 				m_freem(opts);
2004266f97b5SCy Schubert 		} else {
2005db0ac6deSCy Schubert 			sorwakeup_locked(inp->inp_socket);
2006db0ac6deSCy Schubert 			delivered++;
2007266f97b5SCy Schubert 		}
2008db0ac6deSCy Schubert 		opts = NULL;
2009db0ac6deSCy Schubert 	}
2010db0ac6deSCy Schubert 	m_freem(m);
2011266f97b5SCy Schubert 	*mp = NULL;
2012db0ac6deSCy Schubert 	if (delivered == 0)
2013db0ac6deSCy Schubert 		IP6STAT_DEC(ip6s_delivered);
2014a8fe77d8SBjoern A. Zeeb 	return (IPPROTO_DONE);
201582cd038dSYoshinobu Inoue }
201682cd038dSYoshinobu Inoue 
201782cd038dSYoshinobu Inoue /*
201882cd038dSYoshinobu Inoue  * Reflect the ip6 packet back to the source.
2019686cdd19SJun-ichiro itojun Hagino  * OFF points to the icmp6 header, counted from the top of the mbuf.
202082cd038dSYoshinobu Inoue  */
20210700d2c3SBjoern A. Zeeb static void
20221272577eSXin LI icmp6_reflect(struct mbuf *m, size_t off)
202382cd038dSYoshinobu Inoue {
2024ab861e6cSAlexander V. Chernikov 	struct in6_addr src6, *srcp;
2025686cdd19SJun-ichiro itojun Hagino 	struct ip6_hdr *ip6;
202682cd038dSYoshinobu Inoue 	struct icmp6_hdr *icmp6;
20278c0fec80SRobert Watson 	struct in6_ifaddr *ia = NULL;
20283e88eb90SAndrey V. Elsukov 	struct ifnet *outif = NULL;
2029686cdd19SJun-ichiro itojun Hagino 	int plen;
2030ab861e6cSAlexander V. Chernikov 	int type, code, hlim;
203182cd038dSYoshinobu Inoue 
2032686cdd19SJun-ichiro itojun Hagino 	/* too short to reflect */
2033686cdd19SJun-ichiro itojun Hagino 	if (off < sizeof(struct ip6_hdr)) {
203433841545SHajimu UMEMOTO 		nd6log((LOG_DEBUG,
203533841545SHajimu UMEMOTO 		    "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
2036686cdd19SJun-ichiro itojun Hagino 		    (u_long)off, (u_long)sizeof(struct ip6_hdr),
203733841545SHajimu UMEMOTO 		    __FILE__, __LINE__));
2038686cdd19SJun-ichiro itojun Hagino 		goto bad;
2039686cdd19SJun-ichiro itojun Hagino 	}
2040686cdd19SJun-ichiro itojun Hagino 
204182cd038dSYoshinobu Inoue 	/*
204282cd038dSYoshinobu Inoue 	 * If there are extra headers between IPv6 and ICMPv6, strip
204382cd038dSYoshinobu Inoue 	 * off that header first.
204482cd038dSYoshinobu Inoue 	 */
2045686cdd19SJun-ichiro itojun Hagino #ifdef DIAGNOSTIC
2046686cdd19SJun-ichiro itojun Hagino 	if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
2047686cdd19SJun-ichiro itojun Hagino 		panic("assumption failed in icmp6_reflect");
2048686cdd19SJun-ichiro itojun Hagino #endif
2049686cdd19SJun-ichiro itojun Hagino 	if (off > sizeof(struct ip6_hdr)) {
2050686cdd19SJun-ichiro itojun Hagino 		size_t l;
2051686cdd19SJun-ichiro itojun Hagino 		struct ip6_hdr nip6;
205282cd038dSYoshinobu Inoue 
2053686cdd19SJun-ichiro itojun Hagino 		l = off - sizeof(struct ip6_hdr);
2054686cdd19SJun-ichiro itojun Hagino 		m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
2055686cdd19SJun-ichiro itojun Hagino 		m_adj(m, l);
2056686cdd19SJun-ichiro itojun Hagino 		l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2057686cdd19SJun-ichiro itojun Hagino 		if (m->m_len < l) {
2058686cdd19SJun-ichiro itojun Hagino 			if ((m = m_pullup(m, l)) == NULL)
2059686cdd19SJun-ichiro itojun Hagino 				return;
206082cd038dSYoshinobu Inoue 		}
2061686cdd19SJun-ichiro itojun Hagino 		bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
2062686cdd19SJun-ichiro itojun Hagino 	} else /* off == sizeof(struct ip6_hdr) */ {
2063686cdd19SJun-ichiro itojun Hagino 		size_t l;
2064686cdd19SJun-ichiro itojun Hagino 		l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2065686cdd19SJun-ichiro itojun Hagino 		if (m->m_len < l) {
2066686cdd19SJun-ichiro itojun Hagino 			if ((m = m_pullup(m, l)) == NULL)
2067686cdd19SJun-ichiro itojun Hagino 				return;
206882cd038dSYoshinobu Inoue 		}
2069686cdd19SJun-ichiro itojun Hagino 	}
2070686cdd19SJun-ichiro itojun Hagino 	plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
207182cd038dSYoshinobu Inoue 	ip6 = mtod(m, struct ip6_hdr *);
207282cd038dSYoshinobu Inoue 	ip6->ip6_nxt = IPPROTO_ICMPV6;
207382cd038dSYoshinobu Inoue 	icmp6 = (struct icmp6_hdr *)(ip6 + 1);
207482cd038dSYoshinobu Inoue 	type = icmp6->icmp6_type; /* keep type for statistics */
207582cd038dSYoshinobu Inoue 	code = icmp6->icmp6_code; /* ditto. */
2076ab861e6cSAlexander V. Chernikov 	hlim = 0;
2077ab861e6cSAlexander V. Chernikov 	srcp = NULL;
207882cd038dSYoshinobu Inoue 
207982cd038dSYoshinobu Inoue 	/*
208082cd038dSYoshinobu Inoue 	 * If the incoming packet was addressed directly to us (i.e. unicast),
208182cd038dSYoshinobu Inoue 	 * use dst as the src for the reply.
208206cd0a3fSHajimu UMEMOTO 	 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible
2083686cdd19SJun-ichiro itojun Hagino 	 * (for example) when we encounter an error while forwarding procedure
2084686cdd19SJun-ichiro itojun Hagino 	 * destined to a duplicated address of ours.
208582cd038dSYoshinobu Inoue 	 */
20863e88eb90SAndrey V. Elsukov 	if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
20878268d82cSAlexander V. Chernikov 		ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false);
20883e88eb90SAndrey V. Elsukov 		if (ia != NULL && !(ia->ia6_flags &
2089ab861e6cSAlexander V. Chernikov 		    (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) {
2090ab861e6cSAlexander V. Chernikov 			src6 = ia->ia_addr.sin6_addr;
2091ab861e6cSAlexander V. Chernikov 			srcp = &src6;
2092ab861e6cSAlexander V. Chernikov 
2093ab861e6cSAlexander V. Chernikov 			if (m->m_pkthdr.rcvif != NULL) {
2094ab861e6cSAlexander V. Chernikov 				/* XXX: This may not be the outgoing interface */
2095ab861e6cSAlexander V. Chernikov 				hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
2096ab861e6cSAlexander V. Chernikov 			} else
2097ab861e6cSAlexander V. Chernikov 				hlim = V_ip6_defhlim;
2098ab861e6cSAlexander V. Chernikov 		}
209982cd038dSYoshinobu Inoue 	}
210082cd038dSYoshinobu Inoue 
210188d166bfSBjoern A. Zeeb 	if (srcp == NULL) {
2102601c0b8bSAlexander V. Chernikov 		int error;
2103601c0b8bSAlexander V. Chernikov 		struct in6_addr dst6;
2104601c0b8bSAlexander V. Chernikov 		uint32_t scopeid;
210533841545SHajimu UMEMOTO 
210682cd038dSYoshinobu Inoue 		/*
2107686cdd19SJun-ichiro itojun Hagino 		 * This case matches to multicasts, our anycast, or unicasts
210833841545SHajimu UMEMOTO 		 * that we do not own.  Select a source address based on the
210933841545SHajimu UMEMOTO 		 * source address of the erroneous packet.
211082cd038dSYoshinobu Inoue 		 */
21115a03e781SAndrey V. Elsukov 		in6_splitscope(&ip6->ip6_src, &dst6, &scopeid);
2112559b4296SAlan Somers 		error = in6_selectsrc_addr(M_GETFIB(m), &dst6,
2113601c0b8bSAlexander V. Chernikov 		    scopeid, NULL, &src6, &hlim);
2114a1f7e5f8SHajimu UMEMOTO 
2115601c0b8bSAlexander V. Chernikov 		if (error) {
21161d54aa3bSBjoern A. Zeeb 			char ip6buf[INET6_ADDRSTRLEN];
211733841545SHajimu UMEMOTO 			nd6log((LOG_DEBUG,
211833841545SHajimu UMEMOTO 			    "icmp6_reflect: source can't be determined: "
211933841545SHajimu UMEMOTO 			    "dst=%s, error=%d\n",
2120601c0b8bSAlexander V. Chernikov 			    ip6_sprintf(ip6buf, &ip6->ip6_dst), error));
212182cd038dSYoshinobu Inoue 			goto bad;
212233841545SHajimu UMEMOTO 		}
2123ab861e6cSAlexander V. Chernikov 		srcp = &src6;
212433841545SHajimu UMEMOTO 	}
21253e88eb90SAndrey V. Elsukov 	/*
21263e88eb90SAndrey V. Elsukov 	 * ip6_input() drops a packet if its src is multicast.
21273e88eb90SAndrey V. Elsukov 	 * So, the src is never multicast.
21283e88eb90SAndrey V. Elsukov 	 */
21293e88eb90SAndrey V. Elsukov 	ip6->ip6_dst = ip6->ip6_src;
213088d166bfSBjoern A. Zeeb 	ip6->ip6_src = *srcp;
213182cd038dSYoshinobu Inoue 	ip6->ip6_flow = 0;
2132686cdd19SJun-ichiro itojun Hagino 	ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2133686cdd19SJun-ichiro itojun Hagino 	ip6->ip6_vfc |= IPV6_VERSION;
213482cd038dSYoshinobu Inoue 	ip6->ip6_nxt = IPPROTO_ICMPV6;
2135ab861e6cSAlexander V. Chernikov 	ip6->ip6_hlim = hlim;
213682cd038dSYoshinobu Inoue 
213782cd038dSYoshinobu Inoue 	icmp6->icmp6_cksum = 0;
213882cd038dSYoshinobu Inoue 	icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
213982cd038dSYoshinobu Inoue 	    sizeof(struct ip6_hdr), plen);
214082cd038dSYoshinobu Inoue 
214182cd038dSYoshinobu Inoue 	/*
214233841545SHajimu UMEMOTO 	 * XXX option handling
214382cd038dSYoshinobu Inoue 	 */
214482cd038dSYoshinobu Inoue 
214582cd038dSYoshinobu Inoue 	m->m_flags &= ~(M_BCAST|M_MCAST);
2146849eeaa5SAndrey V. Elsukov 	m->m_pkthdr.rcvif = NULL;
21475d846453SSam Leffler 	ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
214882cd038dSYoshinobu Inoue 	if (outif)
214982cd038dSYoshinobu Inoue 		icmp6_ifoutstat_inc(outif, type, code);
215082cd038dSYoshinobu Inoue 
215182cd038dSYoshinobu Inoue 	return;
215282cd038dSYoshinobu Inoue 
215382cd038dSYoshinobu Inoue  bad:
215482cd038dSYoshinobu Inoue 	m_freem(m);
215582cd038dSYoshinobu Inoue 	return;
215682cd038dSYoshinobu Inoue }
215782cd038dSYoshinobu Inoue 
215882cd038dSYoshinobu Inoue static const char *
21591272577eSXin LI icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6,
21601272577eSXin LI     struct in6_addr *tgt6)
216182cd038dSYoshinobu Inoue {
216282cd038dSYoshinobu Inoue 	static char buf[1024];
21631d54aa3bSBjoern A. Zeeb 	char ip6bufs[INET6_ADDRSTRLEN];
21641d54aa3bSBjoern A. Zeeb 	char ip6bufd[INET6_ADDRSTRLEN];
21651d54aa3bSBjoern A. Zeeb 	char ip6buft[INET6_ADDRSTRLEN];
216682cd038dSYoshinobu Inoue 	snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
21671d54aa3bSBjoern A. Zeeb 	    ip6_sprintf(ip6bufs, src6), ip6_sprintf(ip6bufd, dst6),
21681d54aa3bSBjoern A. Zeeb 	    ip6_sprintf(ip6buft, tgt6));
216982cd038dSYoshinobu Inoue 	return buf;
217082cd038dSYoshinobu Inoue }
217182cd038dSYoshinobu Inoue 
217282cd038dSYoshinobu Inoue void
21731272577eSXin LI icmp6_redirect_input(struct mbuf *m, int off)
217482cd038dSYoshinobu Inoue {
21752cb64cb2SGeorge V. Neville-Neil 	struct ifnet *ifp;
2176503f4e47SBjoern A. Zeeb 	struct ip6_hdr *ip6;
2177686cdd19SJun-ichiro itojun Hagino 	struct nd_redirect *nd_rd;
2178a61b5cfbSBjoern A. Zeeb 	struct in6_addr src6, redtgt6, reddst6;
217982cd038dSYoshinobu Inoue 	union nd_opts ndopts;
21801d54aa3bSBjoern A. Zeeb 	char ip6buf[INET6_ADDRSTRLEN];
2181503f4e47SBjoern A. Zeeb 	char *lladdr;
2182503f4e47SBjoern A. Zeeb 	int icmp6len, is_onlink, is_router, lladdrlen;
218382cd038dSYoshinobu Inoue 
218437c1ff48SGleb Smirnoff 	M_ASSERTPKTHDR(m);
218537c1ff48SGleb Smirnoff 	KASSERT(m->m_pkthdr.rcvif != NULL, ("%s: no rcvif", __func__));
21862cb64cb2SGeorge V. Neville-Neil 
218782cd038dSYoshinobu Inoue 	/* XXX if we are router, we don't update route by icmp6 redirect */
2188603724d3SBjoern A. Zeeb 	if (V_ip6_forwarding)
2189686cdd19SJun-ichiro itojun Hagino 		goto freeit;
2190603724d3SBjoern A. Zeeb 	if (!V_icmp6_rediraccept)
2191686cdd19SJun-ichiro itojun Hagino 		goto freeit;
2192686cdd19SJun-ichiro itojun Hagino 
2193a4061289SAndrey V. Elsukov 	/* RFC 6980: Nodes MUST silently ignore fragments */
2194a4061289SAndrey V. Elsukov 	if(m->m_flags & M_FRAGMENTED)
2195a4061289SAndrey V. Elsukov 		goto freeit;
2196a4061289SAndrey V. Elsukov 
2197503f4e47SBjoern A. Zeeb 	ip6 = mtod(m, struct ip6_hdr *);
2198503f4e47SBjoern A. Zeeb 	icmp6len = ntohs(ip6->ip6_plen);
2199a4adf6ccSBjoern A. Zeeb 	if (m->m_len < off + icmp6len) {
2200a61b5cfbSBjoern A. Zeeb 		m = m_pullup(m, off + icmp6len);
2201a61b5cfbSBjoern A. Zeeb 		if (m == NULL) {
2202a61b5cfbSBjoern A. Zeeb 			IP6STAT_INC(ip6s_exthdrtoolong);
220382cd038dSYoshinobu Inoue 			return;
2204686cdd19SJun-ichiro itojun Hagino 		}
2205a4adf6ccSBjoern A. Zeeb 	}
2206a61b5cfbSBjoern A. Zeeb 	ip6 = mtod(m, struct ip6_hdr *);
2207a61b5cfbSBjoern A. Zeeb 	nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2208503f4e47SBjoern A. Zeeb 
2209503f4e47SBjoern A. Zeeb 	ifp = m->m_pkthdr.rcvif;
2210686cdd19SJun-ichiro itojun Hagino 	redtgt6 = nd_rd->nd_rd_target;
2211686cdd19SJun-ichiro itojun Hagino 	reddst6 = nd_rd->nd_rd_dst;
221282cd038dSYoshinobu Inoue 
2213503f4e47SBjoern A. Zeeb 	if (in6_setscope(&redtgt6, ifp, NULL) ||
2214503f4e47SBjoern A. Zeeb 	    in6_setscope(&reddst6, ifp, NULL)) {
2215a1f7e5f8SHajimu UMEMOTO 		goto freeit;
2216a1f7e5f8SHajimu UMEMOTO 	}
221782cd038dSYoshinobu Inoue 
221882cd038dSYoshinobu Inoue 	/* validation */
2219503f4e47SBjoern A. Zeeb 	src6 = ip6->ip6_src;
222082cd038dSYoshinobu Inoue 	if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
222133841545SHajimu UMEMOTO 		nd6log((LOG_ERR,
222282cd038dSYoshinobu Inoue 		    "ICMP6 redirect sent from %s rejected; "
222306cd0a3fSHajimu UMEMOTO 		    "must be from linklocal\n",
22241d54aa3bSBjoern A. Zeeb 		    ip6_sprintf(ip6buf, &src6)));
222533841545SHajimu UMEMOTO 		goto bad;
222682cd038dSYoshinobu Inoue 	}
22274caea9b1SMark Johnston 	if (__predict_false(ip6->ip6_hlim != 255)) {
22284caea9b1SMark Johnston 		ICMP6STAT_INC(icp6s_invlhlim);
222933841545SHajimu UMEMOTO 		nd6log((LOG_ERR,
223082cd038dSYoshinobu Inoue 		    "ICMP6 redirect sent from %s rejected; "
223182cd038dSYoshinobu Inoue 		    "hlim=%d (must be 255)\n",
22321d54aa3bSBjoern A. Zeeb 		    ip6_sprintf(ip6buf, &src6), ip6->ip6_hlim));
223333841545SHajimu UMEMOTO 		goto bad;
223482cd038dSYoshinobu Inoue 	}
223582cd038dSYoshinobu Inoue     {
223682cd038dSYoshinobu Inoue 	/* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
22376ad7446cSAlexander V. Chernikov 	struct nhop_object *nh;
22389977be4aSAlexander V. Chernikov 	struct in6_addr kdst;
22399977be4aSAlexander V. Chernikov 	uint32_t scopeid;
224082cd038dSYoshinobu Inoue 
22419977be4aSAlexander V. Chernikov 	in6_splitscope(&reddst6, &kdst, &scopeid);
22426ad7446cSAlexander V. Chernikov 	NET_EPOCH_ASSERT();
22436ad7446cSAlexander V. Chernikov 	nh = fib6_lookup(ifp->if_fib, &kdst, scopeid, 0, 0);
2244eddfb2e8SAlexander V. Chernikov 	if (nh != NULL) {
22456ad7446cSAlexander V. Chernikov 		struct in6_addr nh_addr;
22466ad7446cSAlexander V. Chernikov 		nh_addr = ifatoia6(nh->nh_ifa)->ia_addr.sin6_addr;
22476ad7446cSAlexander V. Chernikov 		if ((nh->nh_flags & NHF_GATEWAY) == 0) {
224833841545SHajimu UMEMOTO 			nd6log((LOG_ERR,
2249deebc913SHajimu UMEMOTO 			    "ICMP6 redirect rejected; no route "
2250deebc913SHajimu UMEMOTO 			    "with inet6 gateway found for redirect dst: %s\n",
225133841545SHajimu UMEMOTO 			    icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
225233841545SHajimu UMEMOTO 			goto bad;
2253deebc913SHajimu UMEMOTO 		}
2254deebc913SHajimu UMEMOTO 
225543105e58SEric van Gyzen 		/*
22566ad7446cSAlexander V. Chernikov 		 * Embed scope zone id into next hop address.
225743105e58SEric van Gyzen 		 */
22586ad7446cSAlexander V. Chernikov 		nh_addr = nh->gw6_sa.sin6_addr;
225943105e58SEric van Gyzen 
22606ad7446cSAlexander V. Chernikov 		if (IN6_ARE_ADDR_EQUAL(&src6, &nh_addr) == 0) {
226133841545SHajimu UMEMOTO 			nd6log((LOG_ERR,
226282cd038dSYoshinobu Inoue 			    "ICMP6 redirect rejected; "
226382cd038dSYoshinobu Inoue 			    "not equal to gw-for-src=%s (must be same): "
226482cd038dSYoshinobu Inoue 			    "%s\n",
22656ad7446cSAlexander V. Chernikov 			    ip6_sprintf(ip6buf, &nh_addr),
226633841545SHajimu UMEMOTO 			    icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
226733841545SHajimu UMEMOTO 			goto bad;
226882cd038dSYoshinobu Inoue 		}
226982cd038dSYoshinobu Inoue 	} else {
227033841545SHajimu UMEMOTO 		nd6log((LOG_ERR,
227182cd038dSYoshinobu Inoue 		    "ICMP6 redirect rejected; "
227282cd038dSYoshinobu Inoue 		    "no route found for redirect dst: %s\n",
227333841545SHajimu UMEMOTO 		    icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
227433841545SHajimu UMEMOTO 		goto bad;
227582cd038dSYoshinobu Inoue 	}
227682cd038dSYoshinobu Inoue     }
227782cd038dSYoshinobu Inoue 	if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
227833841545SHajimu UMEMOTO 		nd6log((LOG_ERR,
227982cd038dSYoshinobu Inoue 		    "ICMP6 redirect rejected; "
228082cd038dSYoshinobu Inoue 		    "redirect dst must be unicast: %s\n",
228133841545SHajimu UMEMOTO 		    icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
228233841545SHajimu UMEMOTO 		goto bad;
228382cd038dSYoshinobu Inoue 	}
228482cd038dSYoshinobu Inoue 
228582cd038dSYoshinobu Inoue 	is_router = is_onlink = 0;
228682cd038dSYoshinobu Inoue 	if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
228782cd038dSYoshinobu Inoue 		is_router = 1;	/* router case */
228882cd038dSYoshinobu Inoue 	if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
228982cd038dSYoshinobu Inoue 		is_onlink = 1;	/* on-link destination case */
229082cd038dSYoshinobu Inoue 	if (!is_router && !is_onlink) {
229133841545SHajimu UMEMOTO 		nd6log((LOG_ERR,
229282cd038dSYoshinobu Inoue 		    "ICMP6 redirect rejected; "
229382cd038dSYoshinobu Inoue 		    "neither router case nor onlink case: %s\n",
229433841545SHajimu UMEMOTO 		    icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
229533841545SHajimu UMEMOTO 		goto bad;
229682cd038dSYoshinobu Inoue 	}
229782cd038dSYoshinobu Inoue 
229882cd038dSYoshinobu Inoue 	icmp6len -= sizeof(*nd_rd);
229982cd038dSYoshinobu Inoue 	nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
230082cd038dSYoshinobu Inoue 	if (nd6_options(&ndopts) < 0) {
230137c1ff48SGleb Smirnoff 		nd6log((LOG_INFO, "%s: invalid ND option, rejected: %s\n",
230237c1ff48SGleb Smirnoff 		    __func__, icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
230333841545SHajimu UMEMOTO 		/* nd6_options have incremented stats */
2304686cdd19SJun-ichiro itojun Hagino 		goto freeit;
230582cd038dSYoshinobu Inoue 	}
230682cd038dSYoshinobu Inoue 
2307503f4e47SBjoern A. Zeeb 	lladdr = NULL;
2308503f4e47SBjoern A. Zeeb 	lladdrlen = 0;
230982cd038dSYoshinobu Inoue 	if (ndopts.nd_opts_tgt_lladdr) {
231082cd038dSYoshinobu Inoue 		lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
231182cd038dSYoshinobu Inoue 		lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
231282cd038dSYoshinobu Inoue 	}
231382cd038dSYoshinobu Inoue 
231482cd038dSYoshinobu Inoue 	if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
231537c1ff48SGleb Smirnoff 		nd6log((LOG_INFO, "%s: lladdrlen mismatch for %s "
231682cd038dSYoshinobu Inoue 		    "(if %d, icmp6 packet %d): %s\n",
231737c1ff48SGleb Smirnoff 		    __func__, ip6_sprintf(ip6buf, &redtgt6),
23181d54aa3bSBjoern A. Zeeb 		    ifp->if_addrlen, lladdrlen - 2,
231933841545SHajimu UMEMOTO 		    icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
232033841545SHajimu UMEMOTO 		goto bad;
232182cd038dSYoshinobu Inoue 	}
232282cd038dSYoshinobu Inoue 
2323bfbc08b8SBjoern A. Zeeb 	/* Validation passed. */
2324bfbc08b8SBjoern A. Zeeb 
232582cd038dSYoshinobu Inoue 	/* RFC 2461 8.3 */
232682cd038dSYoshinobu Inoue 	nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
232782cd038dSYoshinobu Inoue 	    is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
232882cd038dSYoshinobu Inoue 
232917a03656SEric van Gyzen 	/*
233017a03656SEric van Gyzen 	 * Install a gateway route in the better-router case or an interface
233117a03656SEric van Gyzen 	 * route in the on-link-destination case.
233217a03656SEric van Gyzen 	 */
233317a03656SEric van Gyzen 	{
233482cd038dSYoshinobu Inoue 		struct sockaddr_in6 sdst;
233582cd038dSYoshinobu Inoue 		struct sockaddr_in6 sgw;
233682cd038dSYoshinobu Inoue 		struct sockaddr_in6 ssrc;
233717a03656SEric van Gyzen 		struct sockaddr *gw;
233817a03656SEric van Gyzen 		int rt_flags;
233981d5d46bSBjoern A. Zeeb 		u_int fibnum;
234082cd038dSYoshinobu Inoue 
234182cd038dSYoshinobu Inoue 		bzero(&sdst, sizeof(sdst));
234282cd038dSYoshinobu Inoue 		bzero(&ssrc, sizeof(ssrc));
234317a03656SEric van Gyzen 		sdst.sin6_family = ssrc.sin6_family = AF_INET6;
234417a03656SEric van Gyzen 		sdst.sin6_len = ssrc.sin6_len = sizeof(struct sockaddr_in6);
234582cd038dSYoshinobu Inoue 		bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
234682cd038dSYoshinobu Inoue 		bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
234734a5582cSAlexander V. Chernikov 		rt_flags = 0;
234817a03656SEric van Gyzen 		if (is_router) {
234917a03656SEric van Gyzen 			bzero(&sgw, sizeof(sgw));
235017a03656SEric van Gyzen 			sgw.sin6_family = AF_INET6;
235117a03656SEric van Gyzen 			sgw.sin6_len = sizeof(struct sockaddr_in6);
235217a03656SEric van Gyzen 			bcopy(&redtgt6, &sgw.sin6_addr,
235317a03656SEric van Gyzen 				sizeof(struct in6_addr));
235417a03656SEric van Gyzen 			gw = (struct sockaddr *)&sgw;
235517a03656SEric van Gyzen 			rt_flags |= RTF_GATEWAY;
235617a03656SEric van Gyzen 		} else
235717a03656SEric van Gyzen 			gw = ifp->if_addr->ifa_addr;
235881d5d46bSBjoern A. Zeeb 		for (fibnum = 0; fibnum < rt_numfibs; fibnum++)
235934a5582cSAlexander V. Chernikov 			rib_add_redirect(fibnum, (struct sockaddr *)&sdst, gw,
236034a5582cSAlexander V. Chernikov 			    (struct sockaddr *)&ssrc, ifp, rt_flags,
236134a5582cSAlexander V. Chernikov 			    V_icmp6_redirtimeout);
236282cd038dSYoshinobu Inoue 	}
2363686cdd19SJun-ichiro itojun Hagino 
2364686cdd19SJun-ichiro itojun Hagino  freeit:
2365686cdd19SJun-ichiro itojun Hagino 	m_freem(m);
236633841545SHajimu UMEMOTO 	return;
236733841545SHajimu UMEMOTO 
236833841545SHajimu UMEMOTO  bad:
2369e27b0c87SRobert Watson 	ICMP6STAT_INC(icp6s_badredirect);
237033841545SHajimu UMEMOTO 	m_freem(m);
237182cd038dSYoshinobu Inoue }
237282cd038dSYoshinobu Inoue 
237382cd038dSYoshinobu Inoue void
23749ac7c6cfSAlexander V. Chernikov icmp6_redirect_output(struct mbuf *m0, struct nhop_object *nh)
237582cd038dSYoshinobu Inoue {
237682cd038dSYoshinobu Inoue 	struct ifnet *ifp;	/* my outgoing interface */
237782cd038dSYoshinobu Inoue 	struct in6_addr *ifp_ll6;
237882cd038dSYoshinobu Inoue 	struct in6_addr *router_ll6;
237982cd038dSYoshinobu Inoue 	struct ip6_hdr *sip6;	/* m0 as struct ip6_hdr */
238082cd038dSYoshinobu Inoue 	struct mbuf *m = NULL;	/* newly allocated one */
23811db8d1f8SAna Kukec 	struct m_tag *mtag;
238282cd038dSYoshinobu Inoue 	struct ip6_hdr *ip6;	/* m as struct ip6_hdr */
238382cd038dSYoshinobu Inoue 	struct nd_redirect *nd_rd;
238456c423b0SKip Macy 	struct llentry *ln = NULL;
238582cd038dSYoshinobu Inoue 	size_t maxlen;
238682cd038dSYoshinobu Inoue 	u_char *p;
238782cd038dSYoshinobu Inoue 	struct ifnet *outif = NULL;
2388686cdd19SJun-ichiro itojun Hagino 	struct sockaddr_in6 src_sa;
2389686cdd19SJun-ichiro itojun Hagino 
239049dc650cSAndrey V. Elsukov 	icmp6_errcount(ND_REDIRECT, 0);
239182cd038dSYoshinobu Inoue 
239282cd038dSYoshinobu Inoue 	/* if we are not router, we don't send icmp6 redirect */
2393603724d3SBjoern A. Zeeb 	if (!V_ip6_forwarding)
239482cd038dSYoshinobu Inoue 		goto fail;
239582cd038dSYoshinobu Inoue 
239682cd038dSYoshinobu Inoue 	/* sanity check */
23979ac7c6cfSAlexander V. Chernikov 	if (!m0 || !nh || !(NH_IS_VALID(nh)) || !(ifp = nh->nh_ifp))
239882cd038dSYoshinobu Inoue 		goto fail;
239982cd038dSYoshinobu Inoue 
240082cd038dSYoshinobu Inoue 	/*
240182cd038dSYoshinobu Inoue 	 * Address check:
240282cd038dSYoshinobu Inoue 	 *  the source address must identify a neighbor, and
240382cd038dSYoshinobu Inoue 	 *  the destination address must not be a multicast address
240482cd038dSYoshinobu Inoue 	 *  [RFC 2461, sec 8.2]
240582cd038dSYoshinobu Inoue 	 */
240682cd038dSYoshinobu Inoue 	sip6 = mtod(m0, struct ip6_hdr *);
2407686cdd19SJun-ichiro itojun Hagino 	bzero(&src_sa, sizeof(src_sa));
2408686cdd19SJun-ichiro itojun Hagino 	src_sa.sin6_family = AF_INET6;
2409686cdd19SJun-ichiro itojun Hagino 	src_sa.sin6_len = sizeof(src_sa);
2410686cdd19SJun-ichiro itojun Hagino 	src_sa.sin6_addr = sip6->ip6_src;
2411686cdd19SJun-ichiro itojun Hagino 	if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
241282cd038dSYoshinobu Inoue 		goto fail;
241382cd038dSYoshinobu Inoue 	if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
241482cd038dSYoshinobu Inoue 		goto fail;	/* what should we do here? */
241582cd038dSYoshinobu Inoue 
241682cd038dSYoshinobu Inoue 	/* rate limit */
241782cd038dSYoshinobu Inoue 	if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
241882cd038dSYoshinobu Inoue 		goto fail;
241982cd038dSYoshinobu Inoue 
242082cd038dSYoshinobu Inoue 	/*
242182cd038dSYoshinobu Inoue 	 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
242282cd038dSYoshinobu Inoue 	 * we almost always ask for an mbuf cluster for simplicity.
242382cd038dSYoshinobu Inoue 	 * (MHLEN < IPV6_MMTU is almost always true)
242482cd038dSYoshinobu Inoue 	 */
2425686cdd19SJun-ichiro itojun Hagino #if IPV6_MMTU >= MCLBYTES
2426686cdd19SJun-ichiro itojun Hagino # error assumption failed about IPV6_MMTU and MCLBYTES
2427686cdd19SJun-ichiro itojun Hagino #endif
24287b07d1beSGleb Smirnoff 	m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
24297b07d1beSGleb Smirnoff 	if (m == NULL)
243082cd038dSYoshinobu Inoue 		goto fail;
24319ac7c6cfSAlexander V. Chernikov 	M_SETFIB(m, M_GETFIB(m0));
243233841545SHajimu UMEMOTO 	maxlen = M_TRAILINGSPACE(m);
243382cd038dSYoshinobu Inoue 	maxlen = min(IPV6_MMTU, maxlen);
243482cd038dSYoshinobu Inoue 	/* just for safety */
2435686cdd19SJun-ichiro itojun Hagino 	if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2436686cdd19SJun-ichiro itojun Hagino 	    ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
243782cd038dSYoshinobu Inoue 		goto fail;
2438686cdd19SJun-ichiro itojun Hagino 	}
243982cd038dSYoshinobu Inoue 
244082cd038dSYoshinobu Inoue 	{
244182cd038dSYoshinobu Inoue 		/* get ip6 linklocal address for ifp(my outgoing interface). */
2442686cdd19SJun-ichiro itojun Hagino 		struct in6_ifaddr *ia;
2443686cdd19SJun-ichiro itojun Hagino 		if ((ia = in6ifa_ifpforlinklocal(ifp,
2444686cdd19SJun-ichiro itojun Hagino 						 IN6_IFF_NOTREADY|
2445686cdd19SJun-ichiro itojun Hagino 						 IN6_IFF_ANYCAST)) == NULL)
244682cd038dSYoshinobu Inoue 			goto fail;
244782cd038dSYoshinobu Inoue 		ifp_ll6 = &ia->ia_addr.sin6_addr;
24488c0fec80SRobert Watson 		/* XXXRW: reference released prematurely. */
24498c0fec80SRobert Watson 		ifa_free(&ia->ia_ifa);
245082cd038dSYoshinobu Inoue 	}
245182cd038dSYoshinobu Inoue 
245282cd038dSYoshinobu Inoue 	/* get ip6 linklocal address for the router. */
24539ac7c6cfSAlexander V. Chernikov 	if (nh->nh_flags & NHF_GATEWAY) {
245482cd038dSYoshinobu Inoue 		struct sockaddr_in6 *sin6;
24559ac7c6cfSAlexander V. Chernikov 		sin6 = &nh->gw6_sa;
245682cd038dSYoshinobu Inoue 		router_ll6 = &sin6->sin6_addr;
245782cd038dSYoshinobu Inoue 		if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
245882cd038dSYoshinobu Inoue 			router_ll6 = (struct in6_addr *)NULL;
245982cd038dSYoshinobu Inoue 	} else
246082cd038dSYoshinobu Inoue 		router_ll6 = (struct in6_addr *)NULL;
246182cd038dSYoshinobu Inoue 
246282cd038dSYoshinobu Inoue 	/* ip6 */
246382cd038dSYoshinobu Inoue 	ip6 = mtod(m, struct ip6_hdr *);
246482cd038dSYoshinobu Inoue 	ip6->ip6_flow = 0;
2465686cdd19SJun-ichiro itojun Hagino 	ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2466686cdd19SJun-ichiro itojun Hagino 	ip6->ip6_vfc |= IPV6_VERSION;
246782cd038dSYoshinobu Inoue 	/* ip6->ip6_plen will be set later */
246882cd038dSYoshinobu Inoue 	ip6->ip6_nxt = IPPROTO_ICMPV6;
246982cd038dSYoshinobu Inoue 	ip6->ip6_hlim = 255;
247082cd038dSYoshinobu Inoue 	/* ip6->ip6_src must be linklocal addr for my outgoing if. */
247182cd038dSYoshinobu Inoue 	bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
247282cd038dSYoshinobu Inoue 	bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
247382cd038dSYoshinobu Inoue 
247482cd038dSYoshinobu Inoue 	/* ND Redirect */
247582cd038dSYoshinobu Inoue 	nd_rd = (struct nd_redirect *)(ip6 + 1);
247682cd038dSYoshinobu Inoue 	nd_rd->nd_rd_type = ND_REDIRECT;
247782cd038dSYoshinobu Inoue 	nd_rd->nd_rd_code = 0;
247882cd038dSYoshinobu Inoue 	nd_rd->nd_rd_reserved = 0;
24799ac7c6cfSAlexander V. Chernikov 	if (nh->nh_flags & NHF_GATEWAY) {
248082cd038dSYoshinobu Inoue 		/*
248182cd038dSYoshinobu Inoue 		 * nd_rd->nd_rd_target must be a link-local address in
248282cd038dSYoshinobu Inoue 		 * better router cases.
248382cd038dSYoshinobu Inoue 		 */
248482cd038dSYoshinobu Inoue 		if (!router_ll6)
248582cd038dSYoshinobu Inoue 			goto fail;
248682cd038dSYoshinobu Inoue 		bcopy(router_ll6, &nd_rd->nd_rd_target,
248782cd038dSYoshinobu Inoue 		    sizeof(nd_rd->nd_rd_target));
248882cd038dSYoshinobu Inoue 		bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
248982cd038dSYoshinobu Inoue 		    sizeof(nd_rd->nd_rd_dst));
249082cd038dSYoshinobu Inoue 	} else {
249182cd038dSYoshinobu Inoue 		/* make sure redtgt == reddst */
249282cd038dSYoshinobu Inoue 		bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
249382cd038dSYoshinobu Inoue 		    sizeof(nd_rd->nd_rd_target));
249482cd038dSYoshinobu Inoue 		bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
249582cd038dSYoshinobu Inoue 		    sizeof(nd_rd->nd_rd_dst));
249682cd038dSYoshinobu Inoue 	}
249782cd038dSYoshinobu Inoue 
249882cd038dSYoshinobu Inoue 	p = (u_char *)(nd_rd + 1);
249982cd038dSYoshinobu Inoue 
250082cd038dSYoshinobu Inoue 	if (!router_ll6)
250182cd038dSYoshinobu Inoue 		goto nolladdropt;
250282cd038dSYoshinobu Inoue 
250382cd038dSYoshinobu Inoue 	{
250482cd038dSYoshinobu Inoue 		/* target lladdr option */
250582cd038dSYoshinobu Inoue 		int len;
250682cd038dSYoshinobu Inoue 		struct nd_opt_hdr *nd_opt;
250782cd038dSYoshinobu Inoue 		char *lladdr;
250882cd038dSYoshinobu Inoue 
2509c541bd36SAlexander V. Chernikov 		ln = nd6_lookup(router_ll6, LLE_SF(AF_INET6,  0), ifp);
251056c423b0SKip Macy 		if (ln == NULL)
251182cd038dSYoshinobu Inoue 			goto nolladdropt;
25126e6b3f7cSQing Li 
2513686cdd19SJun-ichiro itojun Hagino 		len = sizeof(*nd_opt) + ifp->if_addrlen;
2514686cdd19SJun-ichiro itojun Hagino 		len = (len + 7) & ~7;	/* round by 8 */
2515686cdd19SJun-ichiro itojun Hagino 		/* safety check */
2516686cdd19SJun-ichiro itojun Hagino 		if (len + (p - (u_char *)ip6) > maxlen)
2517686cdd19SJun-ichiro itojun Hagino 			goto nolladdropt;
25186e6b3f7cSQing Li 
25196e6b3f7cSQing Li 		if (ln->la_flags & LLE_VALID) {
252082cd038dSYoshinobu Inoue 			nd_opt = (struct nd_opt_hdr *)p;
252182cd038dSYoshinobu Inoue 			nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
252282cd038dSYoshinobu Inoue 			nd_opt->nd_opt_len = len >> 3;
252382cd038dSYoshinobu Inoue 			lladdr = (char *)(nd_opt + 1);
25244fb3a820SAlexander V. Chernikov 			bcopy(ln->ll_addr, lladdr, ifp->if_addrlen);
2525686cdd19SJun-ichiro itojun Hagino 			p += len;
252682cd038dSYoshinobu Inoue 		}
252782cd038dSYoshinobu Inoue 	}
252856c423b0SKip Macy nolladdropt:
252956c423b0SKip Macy 	if (ln != NULL)
253056c423b0SKip Macy 		LLE_RUNLOCK(ln);
253182cd038dSYoshinobu Inoue 
253282cd038dSYoshinobu Inoue 	m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
253382cd038dSYoshinobu Inoue 
253482cd038dSYoshinobu Inoue 	/* just to be safe */
2535686cdd19SJun-ichiro itojun Hagino #ifdef M_DECRYPTED	/*not openbsd*/
253682cd038dSYoshinobu Inoue 	if (m0->m_flags & M_DECRYPTED)
253782cd038dSYoshinobu Inoue 		goto noredhdropt;
2538686cdd19SJun-ichiro itojun Hagino #endif
2539686cdd19SJun-ichiro itojun Hagino 	if (p - (u_char *)ip6 > maxlen)
2540686cdd19SJun-ichiro itojun Hagino 		goto noredhdropt;
254182cd038dSYoshinobu Inoue 
254282cd038dSYoshinobu Inoue 	{
254382cd038dSYoshinobu Inoue 		/* redirected header option */
254482cd038dSYoshinobu Inoue 		int len;
254582cd038dSYoshinobu Inoue 		struct nd_opt_rd_hdr *nd_opt_rh;
254682cd038dSYoshinobu Inoue 
254782cd038dSYoshinobu Inoue 		/*
254882cd038dSYoshinobu Inoue 		 * compute the maximum size for icmp6 redirect header option.
254982cd038dSYoshinobu Inoue 		 * XXX room for auth header?
255082cd038dSYoshinobu Inoue 		 */
255182cd038dSYoshinobu Inoue 		len = maxlen - (p - (u_char *)ip6);
255282cd038dSYoshinobu Inoue 		len &= ~7;
255382cd038dSYoshinobu Inoue 
255482cd038dSYoshinobu Inoue 		/* This is just for simplicity. */
255582cd038dSYoshinobu Inoue 		if (m0->m_pkthdr.len != m0->m_len) {
255682cd038dSYoshinobu Inoue 			if (m0->m_next) {
255782cd038dSYoshinobu Inoue 				m_freem(m0->m_next);
255882cd038dSYoshinobu Inoue 				m0->m_next = NULL;
255982cd038dSYoshinobu Inoue 			}
256082cd038dSYoshinobu Inoue 			m0->m_pkthdr.len = m0->m_len;
256182cd038dSYoshinobu Inoue 		}
256282cd038dSYoshinobu Inoue 
256382cd038dSYoshinobu Inoue 		/*
256482cd038dSYoshinobu Inoue 		 * Redirected header option spec (RFC2461 4.6.3) talks nothing
256582cd038dSYoshinobu Inoue 		 * about padding/truncate rule for the original IP packet.
256606cd0a3fSHajimu UMEMOTO 		 * From the discussion on IPv6imp in Feb 1999,
256706cd0a3fSHajimu UMEMOTO 		 * the consensus was:
256882cd038dSYoshinobu Inoue 		 * - "attach as much as possible" is the goal
256906cd0a3fSHajimu UMEMOTO 		 * - pad if not aligned (original size can be guessed by
257006cd0a3fSHajimu UMEMOTO 		 *   original ip6 header)
257182cd038dSYoshinobu Inoue 		 * Following code adds the padding if it is simple enough,
257282cd038dSYoshinobu Inoue 		 * and truncates if not.
257382cd038dSYoshinobu Inoue 		 */
257482cd038dSYoshinobu Inoue 		if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
257506cd0a3fSHajimu UMEMOTO 			panic("assumption failed in %s:%d", __FILE__,
257606cd0a3fSHajimu UMEMOTO 			    __LINE__);
257782cd038dSYoshinobu Inoue 
257882cd038dSYoshinobu Inoue 		if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
257982cd038dSYoshinobu Inoue 			/* not enough room, truncate */
258006cd0a3fSHajimu UMEMOTO 			m0->m_pkthdr.len = m0->m_len = len -
258106cd0a3fSHajimu UMEMOTO 			    sizeof(*nd_opt_rh);
258282cd038dSYoshinobu Inoue 		} else {
258382cd038dSYoshinobu Inoue 			/* enough room, pad or truncate */
258482cd038dSYoshinobu Inoue 			size_t extra;
258582cd038dSYoshinobu Inoue 
258682cd038dSYoshinobu Inoue 			extra = m0->m_pkthdr.len % 8;
258782cd038dSYoshinobu Inoue 			if (extra) {
258882cd038dSYoshinobu Inoue 				/* pad if easy enough, truncate if not */
258982cd038dSYoshinobu Inoue 				if (8 - extra <= M_TRAILINGSPACE(m0)) {
259082cd038dSYoshinobu Inoue 					/* pad */
259182cd038dSYoshinobu Inoue 					m0->m_len += (8 - extra);
259282cd038dSYoshinobu Inoue 					m0->m_pkthdr.len += (8 - extra);
259382cd038dSYoshinobu Inoue 				} else {
259482cd038dSYoshinobu Inoue 					/* truncate */
259582cd038dSYoshinobu Inoue 					m0->m_pkthdr.len -= extra;
259682cd038dSYoshinobu Inoue 					m0->m_len -= extra;
259782cd038dSYoshinobu Inoue 				}
259882cd038dSYoshinobu Inoue 			}
259982cd038dSYoshinobu Inoue 			len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
260006cd0a3fSHajimu UMEMOTO 			m0->m_pkthdr.len = m0->m_len = len -
260106cd0a3fSHajimu UMEMOTO 			    sizeof(*nd_opt_rh);
260282cd038dSYoshinobu Inoue 		}
260382cd038dSYoshinobu Inoue 
260482cd038dSYoshinobu Inoue 		nd_opt_rh = (struct nd_opt_rd_hdr *)p;
260582cd038dSYoshinobu Inoue 		bzero(nd_opt_rh, sizeof(*nd_opt_rh));
260682cd038dSYoshinobu Inoue 		nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
260782cd038dSYoshinobu Inoue 		nd_opt_rh->nd_opt_rh_len = len >> 3;
260882cd038dSYoshinobu Inoue 		p += sizeof(*nd_opt_rh);
260982cd038dSYoshinobu Inoue 		m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
261082cd038dSYoshinobu Inoue 
261182cd038dSYoshinobu Inoue 		/* connect m0 to m */
2612db06e8a0SSUZUKI Shinsuke 		m_tag_delete_chain(m0, NULL);
2613db06e8a0SSUZUKI Shinsuke 		m0->m_flags &= ~M_PKTHDR;
261482cd038dSYoshinobu Inoue 		m->m_next = m0;
261582cd038dSYoshinobu Inoue 		m->m_pkthdr.len = m->m_len + m0->m_len;
2616db06e8a0SSUZUKI Shinsuke 		m0 = NULL;
261782cd038dSYoshinobu Inoue 	}
261882cd038dSYoshinobu Inoue noredhdropt:;
2619db06e8a0SSUZUKI Shinsuke 	if (m0) {
2620db06e8a0SSUZUKI Shinsuke 		m_freem(m0);
2621db06e8a0SSUZUKI Shinsuke 		m0 = NULL;
2622db06e8a0SSUZUKI Shinsuke 	}
262382cd038dSYoshinobu Inoue 
26249a4f9608SHajimu UMEMOTO 	/* XXX: clear embedded link IDs in the inner header */
26259a4f9608SHajimu UMEMOTO 	in6_clearscope(&sip6->ip6_src);
26269a4f9608SHajimu UMEMOTO 	in6_clearscope(&sip6->ip6_dst);
26279a4f9608SHajimu UMEMOTO 	in6_clearscope(&nd_rd->nd_rd_target);
26289a4f9608SHajimu UMEMOTO 	in6_clearscope(&nd_rd->nd_rd_dst);
262982cd038dSYoshinobu Inoue 
263082cd038dSYoshinobu Inoue 	ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
263182cd038dSYoshinobu Inoue 
263282cd038dSYoshinobu Inoue 	nd_rd->nd_rd_cksum = 0;
263306cd0a3fSHajimu UMEMOTO 	nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6,
263406cd0a3fSHajimu UMEMOTO 	    sizeof(*ip6), ntohs(ip6->ip6_plen));
263582cd038dSYoshinobu Inoue 
26361db8d1f8SAna Kukec         if (send_sendso_input_hook != NULL) {
26371db8d1f8SAna Kukec 		mtag = m_tag_get(PACKET_TAG_ND_OUTGOING, sizeof(unsigned short),
26381db8d1f8SAna Kukec 			M_NOWAIT);
26391db8d1f8SAna Kukec 		if (mtag == NULL)
26401db8d1f8SAna Kukec 			goto fail;
26411db8d1f8SAna Kukec 		*(unsigned short *)(mtag + 1) = nd_rd->nd_rd_type;
26421db8d1f8SAna Kukec 		m_tag_prepend(m, mtag);
26431db8d1f8SAna Kukec 	}
26441db8d1f8SAna Kukec 
264582cd038dSYoshinobu Inoue 	/* send the packet to outside... */
26465d846453SSam Leffler 	ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
264782cd038dSYoshinobu Inoue 	if (outif) {
264882cd038dSYoshinobu Inoue 		icmp6_ifstat_inc(outif, ifs6_out_msg);
264982cd038dSYoshinobu Inoue 		icmp6_ifstat_inc(outif, ifs6_out_redirect);
265082cd038dSYoshinobu Inoue 	}
2651e27b0c87SRobert Watson 	ICMP6STAT_INC(icp6s_outhist[ND_REDIRECT]);
265282cd038dSYoshinobu Inoue 
265382cd038dSYoshinobu Inoue 	return;
265482cd038dSYoshinobu Inoue 
265582cd038dSYoshinobu Inoue fail:
265682cd038dSYoshinobu Inoue 	if (m)
265782cd038dSYoshinobu Inoue 		m_freem(m);
265882cd038dSYoshinobu Inoue 	if (m0)
265982cd038dSYoshinobu Inoue 		m_freem(m0);
266082cd038dSYoshinobu Inoue }
266182cd038dSYoshinobu Inoue 
266282cd038dSYoshinobu Inoue /*
266382cd038dSYoshinobu Inoue  * ICMPv6 socket option processing.
266482cd038dSYoshinobu Inoue  */
266582cd038dSYoshinobu Inoue int
26661272577eSXin LI icmp6_ctloutput(struct socket *so, struct sockopt *sopt)
266782cd038dSYoshinobu Inoue {
266882cd038dSYoshinobu Inoue 	int error = 0;
266982cd038dSYoshinobu Inoue 	int optlen;
267033841545SHajimu UMEMOTO 	struct inpcb *inp = sotoinpcb(so);
267182cd038dSYoshinobu Inoue 	int level, op, optname;
267282cd038dSYoshinobu Inoue 
267382cd038dSYoshinobu Inoue 	if (sopt) {
267482cd038dSYoshinobu Inoue 		level = sopt->sopt_level;
267582cd038dSYoshinobu Inoue 		op = sopt->sopt_dir;
267682cd038dSYoshinobu Inoue 		optname = sopt->sopt_name;
267782cd038dSYoshinobu Inoue 		optlen = sopt->sopt_valsize;
267882cd038dSYoshinobu Inoue 	} else
267982cd038dSYoshinobu Inoue 		level = op = optname = optlen = 0;
268033841545SHajimu UMEMOTO 
268182cd038dSYoshinobu Inoue 	if (level != IPPROTO_ICMPV6) {
268282cd038dSYoshinobu Inoue 		return EINVAL;
268382cd038dSYoshinobu Inoue 	}
268482cd038dSYoshinobu Inoue 
268582cd038dSYoshinobu Inoue 	switch (op) {
268682cd038dSYoshinobu Inoue 	case PRCO_SETOPT:
268782cd038dSYoshinobu Inoue 		switch (optname) {
268882cd038dSYoshinobu Inoue 		case ICMP6_FILTER:
268982cd038dSYoshinobu Inoue 		    {
2690ae89d5a3SRobert Watson 			struct icmp6_filter ic6f;
269182cd038dSYoshinobu Inoue 
2692ae89d5a3SRobert Watson 			if (optlen != sizeof(ic6f)) {
269382cd038dSYoshinobu Inoue 				error = EMSGSIZE;
269482cd038dSYoshinobu Inoue 				break;
269582cd038dSYoshinobu Inoue 			}
2696ae89d5a3SRobert Watson 			error = sooptcopyin(sopt, &ic6f, optlen, optlen);
2697ae89d5a3SRobert Watson 			if (error == 0) {
2698ae89d5a3SRobert Watson 				INP_WLOCK(inp);
2699ae89d5a3SRobert Watson 				*inp->in6p_icmp6filt = ic6f;
2700ae89d5a3SRobert Watson 				INP_WUNLOCK(inp);
2701ae89d5a3SRobert Watson 			}
270282cd038dSYoshinobu Inoue 			break;
270382cd038dSYoshinobu Inoue 		    }
270482cd038dSYoshinobu Inoue 
270582cd038dSYoshinobu Inoue 		default:
270682cd038dSYoshinobu Inoue 			error = ENOPROTOOPT;
270782cd038dSYoshinobu Inoue 			break;
270882cd038dSYoshinobu Inoue 		}
270982cd038dSYoshinobu Inoue 		break;
271082cd038dSYoshinobu Inoue 
271182cd038dSYoshinobu Inoue 	case PRCO_GETOPT:
271282cd038dSYoshinobu Inoue 		switch (optname) {
271382cd038dSYoshinobu Inoue 		case ICMP6_FILTER:
271482cd038dSYoshinobu Inoue 		    {
2715ae89d5a3SRobert Watson 			struct icmp6_filter ic6f;
2716ae89d5a3SRobert Watson 
2717ae89d5a3SRobert Watson 			INP_RLOCK(inp);
2718ae89d5a3SRobert Watson 			ic6f = *inp->in6p_icmp6filt;
2719ae89d5a3SRobert Watson 			INP_RUNLOCK(inp);
2720ae89d5a3SRobert Watson 			error = sooptcopyout(sopt, &ic6f, sizeof(ic6f));
272182cd038dSYoshinobu Inoue 			break;
272282cd038dSYoshinobu Inoue 		    }
272382cd038dSYoshinobu Inoue 
272482cd038dSYoshinobu Inoue 		default:
272582cd038dSYoshinobu Inoue 			error = ENOPROTOOPT;
272682cd038dSYoshinobu Inoue 			break;
272782cd038dSYoshinobu Inoue 		}
272882cd038dSYoshinobu Inoue 		break;
272982cd038dSYoshinobu Inoue 	}
273082cd038dSYoshinobu Inoue 
273182cd038dSYoshinobu Inoue 	return (error);
273282cd038dSYoshinobu Inoue }
273382cd038dSYoshinobu Inoue 
2734a03aff88SGleb Smirnoff static int sysctl_icmp6lim_and_jitter(SYSCTL_HANDLER_ARGS);
2735a03aff88SGleb Smirnoff VNET_DEFINE_STATIC(u_int, icmp6errppslim) = 100;
2736a03aff88SGleb Smirnoff #define	V_icmp6errppslim	VNET(icmp6errppslim)
2737a03aff88SGleb Smirnoff SYSCTL_PROC(_net_inet6_icmp6, ICMPV6CTL_ERRPPSLIMIT, errppslimit,
2738a03aff88SGleb Smirnoff     CTLTYPE_UINT | CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6errppslim), 0,
2739a03aff88SGleb Smirnoff     &sysctl_icmp6lim_and_jitter, "IU",
2740a03aff88SGleb Smirnoff     "Maximum number of ICMPv6 error/reply messages per second");
2741a03aff88SGleb Smirnoff 
2742a03aff88SGleb Smirnoff VNET_DEFINE_STATIC(int, icmp6lim_curr_jitter) = 0;
2743a03aff88SGleb Smirnoff #define	V_icmp6lim_curr_jitter	VNET(icmp6lim_curr_jitter)
2744a03aff88SGleb Smirnoff 
2745a03aff88SGleb Smirnoff VNET_DEFINE_STATIC(u_int, icmp6lim_jitter) = 8;
2746a03aff88SGleb Smirnoff #define	V_icmp6lim_jitter	VNET(icmp6lim_jitter)
2747a03aff88SGleb Smirnoff SYSCTL_PROC(_net_inet6_icmp6, OID_AUTO, icmp6lim_jitter, CTLTYPE_UINT |
2748a03aff88SGleb Smirnoff     CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6lim_jitter), 0,
2749a03aff88SGleb Smirnoff     &sysctl_icmp6lim_and_jitter, "IU",
2750a03aff88SGleb Smirnoff     "Random errppslimit jitter adjustment limit");
2751a03aff88SGleb Smirnoff 
2752a03aff88SGleb Smirnoff VNET_DEFINE_STATIC(int, icmp6lim_output) = 1;
2753a03aff88SGleb Smirnoff #define	V_icmp6lim_output	VNET(icmp6lim_output)
2754a03aff88SGleb Smirnoff SYSCTL_INT(_net_inet6_icmp6, OID_AUTO, icmp6lim_output,
2755a03aff88SGleb Smirnoff     CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(icmp6lim_output), 0,
2756a03aff88SGleb Smirnoff     "Enable logging of ICMPv6 response rate limiting");
2757a03aff88SGleb Smirnoff 
2758a03aff88SGleb Smirnoff typedef enum {
2759a03aff88SGleb Smirnoff 	RATELIM_PARAM_PROB = 0,
2760a03aff88SGleb Smirnoff 	RATELIM_TOO_BIG,
2761a03aff88SGleb Smirnoff 	RATELIM_UNREACH,
2762a03aff88SGleb Smirnoff 	RATELIM_TEXCEED,
2763a03aff88SGleb Smirnoff 	RATELIM_REDIR,
2764a03aff88SGleb Smirnoff 	RATELIM_REPLY,
2765a03aff88SGleb Smirnoff 	RATELIM_OTHER,
2766a03aff88SGleb Smirnoff 	RATELIM_MAX
2767a03aff88SGleb Smirnoff } ratelim_which;
2768a03aff88SGleb Smirnoff 
2769a03aff88SGleb Smirnoff static const char *icmp6_rate_descrs[RATELIM_MAX] = {
2770a03aff88SGleb Smirnoff 	[RATELIM_PARAM_PROB] = "bad IPv6 header",
2771a03aff88SGleb Smirnoff 	[RATELIM_TOO_BIG] = "packet too big",
2772a03aff88SGleb Smirnoff 	[RATELIM_UNREACH] = "destination unreachable",
2773a03aff88SGleb Smirnoff 	[RATELIM_TEXCEED] = "time exceeded",
2774a03aff88SGleb Smirnoff 	[RATELIM_REPLY] = "echo reply",
2775a03aff88SGleb Smirnoff 	[RATELIM_REDIR] = "neighbor discovery redirect",
2776a03aff88SGleb Smirnoff 	[RATELIM_OTHER] = "(other)",
2777a03aff88SGleb Smirnoff };
2778a03aff88SGleb Smirnoff 
2779a03aff88SGleb Smirnoff static void
2780a03aff88SGleb Smirnoff icmp6lim_new_jitter(void)
2781a03aff88SGleb Smirnoff {
2782a03aff88SGleb Smirnoff 	/*
2783a03aff88SGleb Smirnoff 	 * Adjust limit +/- to jitter the measurement to deny a side-channel
2784a03aff88SGleb Smirnoff 	 * port scan as in https://dl.acm.org/doi/10.1145/3372297.3417280
2785a03aff88SGleb Smirnoff 	 */
2786a03aff88SGleb Smirnoff 	if (V_icmp6lim_jitter > 0)
2787a03aff88SGleb Smirnoff 		V_icmp6lim_curr_jitter =
2788a03aff88SGleb Smirnoff 		    arc4random_uniform(V_icmp6lim_jitter * 2 + 1) -
2789a03aff88SGleb Smirnoff 		    V_icmp6lim_jitter;
2790a03aff88SGleb Smirnoff }
2791a03aff88SGleb Smirnoff 
2792a03aff88SGleb Smirnoff static int
2793a03aff88SGleb Smirnoff sysctl_icmp6lim_and_jitter(SYSCTL_HANDLER_ARGS)
2794a03aff88SGleb Smirnoff {
2795a03aff88SGleb Smirnoff 	uint32_t new;
2796a03aff88SGleb Smirnoff 	int error;
2797a03aff88SGleb Smirnoff 	bool lim;
2798a03aff88SGleb Smirnoff 
2799a03aff88SGleb Smirnoff 	MPASS(oidp->oid_arg1 == &VNET_NAME(icmp6errppslim) ||
2800a03aff88SGleb Smirnoff 	    oidp->oid_arg1 == &VNET_NAME(icmp6lim_jitter));
2801a03aff88SGleb Smirnoff 
2802a03aff88SGleb Smirnoff 	lim = (oidp->oid_arg1 == &VNET_NAME(icmp6errppslim));
2803a03aff88SGleb Smirnoff 	new = lim ? V_icmp6errppslim : V_icmp6lim_jitter;
2804a03aff88SGleb Smirnoff 	error = sysctl_handle_int(oidp, &new, 0, req);
2805a03aff88SGleb Smirnoff 	if (error == 0 && req->newptr) {
2806a03aff88SGleb Smirnoff 		if (lim) {
2807*4399e055SGleb Smirnoff 			if (new != 0 && new <= V_icmp6lim_jitter)
2808a03aff88SGleb Smirnoff 				error = EINVAL;
2809a03aff88SGleb Smirnoff 			else
2810a03aff88SGleb Smirnoff 				V_icmp6errppslim = new;
2811a03aff88SGleb Smirnoff 		} else {
2812a03aff88SGleb Smirnoff 			if (new >= V_icmp6errppslim)
2813a03aff88SGleb Smirnoff 				error = EINVAL;
2814a03aff88SGleb Smirnoff 			else {
2815a03aff88SGleb Smirnoff 				V_icmp6lim_jitter = new;
2816a03aff88SGleb Smirnoff 				icmp6lim_new_jitter();
2817a03aff88SGleb Smirnoff 			}
2818a03aff88SGleb Smirnoff 		}
2819a03aff88SGleb Smirnoff 	}
2820a03aff88SGleb Smirnoff 	MPASS(V_icmp6errppslim + V_icmp6lim_curr_jitter > 0);
2821a03aff88SGleb Smirnoff 
2822a03aff88SGleb Smirnoff 	return (error);
2823a03aff88SGleb Smirnoff }
2824a03aff88SGleb Smirnoff 
2825a03aff88SGleb Smirnoff 
2826a03aff88SGleb Smirnoff VNET_DEFINE_STATIC(struct counter_rate, icmp6_rates[RATELIM_MAX]);
2827a03aff88SGleb Smirnoff #define	V_icmp6_rates	VNET(icmp6_rates)
2828a03aff88SGleb Smirnoff 
2829a03aff88SGleb Smirnoff static void
2830a03aff88SGleb Smirnoff icmp6_ratelimit_init(void)
2831a03aff88SGleb Smirnoff {
2832a03aff88SGleb Smirnoff 
2833a03aff88SGleb Smirnoff 	for (int i = 0; i < RATELIM_MAX; i++) {
2834a03aff88SGleb Smirnoff 		V_icmp6_rates[i].cr_rate = counter_u64_alloc(M_WAITOK);
2835a03aff88SGleb Smirnoff 		V_icmp6_rates[i].cr_ticks = ticks;
2836a03aff88SGleb Smirnoff 	}
2837a03aff88SGleb Smirnoff 	icmp6lim_new_jitter();
2838a03aff88SGleb Smirnoff }
2839a03aff88SGleb Smirnoff VNET_SYSINIT(icmp6_ratelimit, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY,
2840a03aff88SGleb Smirnoff     icmp6_ratelimit_init, NULL);
2841a03aff88SGleb Smirnoff 
2842a03aff88SGleb Smirnoff #ifdef VIMAGE
2843a03aff88SGleb Smirnoff static void
2844a03aff88SGleb Smirnoff icmp6_ratelimit_uninit(void)
2845a03aff88SGleb Smirnoff {
2846a03aff88SGleb Smirnoff 
2847a03aff88SGleb Smirnoff 	for (int i = 0; i < RATELIM_MAX; i++)
2848a03aff88SGleb Smirnoff 		counter_u64_free(V_icmp6_rates[i].cr_rate);
2849a03aff88SGleb Smirnoff }
2850a03aff88SGleb Smirnoff VNET_SYSUNINIT(icmp6_ratelimit, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD,
2851a03aff88SGleb Smirnoff     icmp6_ratelimit_uninit, NULL);
2852a03aff88SGleb Smirnoff #endif
2853a03aff88SGleb Smirnoff 
285482cd038dSYoshinobu Inoue /*
285582cd038dSYoshinobu Inoue  * Perform rate limit check.
285682cd038dSYoshinobu Inoue  * Returns 0 if it is okay to send the icmp6 packet.
285782cd038dSYoshinobu Inoue  * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
285882cd038dSYoshinobu Inoue  * limitation.
285982cd038dSYoshinobu Inoue  *
286082cd038dSYoshinobu Inoue  * XXX per-destination/type check necessary?
28611272577eSXin LI  *
28621272577eSXin LI  * dst - not used at this moment
28631272577eSXin LI  * code - not used at this moment
286482cd038dSYoshinobu Inoue  */
2865a974702eSKristof Provost int
2866a03aff88SGleb Smirnoff icmp6_ratelimit(const struct in6_addr *dst, const int type, const int code)
286782cd038dSYoshinobu Inoue {
2868a03aff88SGleb Smirnoff 	ratelim_which which;
2869a03aff88SGleb Smirnoff 	int64_t pps;
287082cd038dSYoshinobu Inoue 
2871a03aff88SGleb Smirnoff 	if (V_icmp6errppslim == 0)
2872a03aff88SGleb Smirnoff 		return (0);
287382cd038dSYoshinobu Inoue 
2874a03aff88SGleb Smirnoff 	switch (type) {
2875a03aff88SGleb Smirnoff 	case ICMP6_PARAM_PROB:
2876a03aff88SGleb Smirnoff 		which = RATELIM_PARAM_PROB;
2877a03aff88SGleb Smirnoff 		break;
2878a03aff88SGleb Smirnoff 	case ICMP6_PACKET_TOO_BIG:
2879a03aff88SGleb Smirnoff 		which = RATELIM_TOO_BIG;
2880a03aff88SGleb Smirnoff 		break;
2881a03aff88SGleb Smirnoff 	case ICMP6_DST_UNREACH:
2882a03aff88SGleb Smirnoff 		which = RATELIM_UNREACH;
2883a03aff88SGleb Smirnoff 		break;
2884a03aff88SGleb Smirnoff 	case ICMP6_TIME_EXCEEDED:
2885a03aff88SGleb Smirnoff 		which = RATELIM_TEXCEED;
2886a03aff88SGleb Smirnoff 		break;
2887a03aff88SGleb Smirnoff 	case ND_REDIRECT:
2888a03aff88SGleb Smirnoff 		which = RATELIM_REDIR;
2889a03aff88SGleb Smirnoff 		break;
2890a03aff88SGleb Smirnoff 	case ICMP6_ECHO_REPLY:
2891a03aff88SGleb Smirnoff 		which = RATELIM_REPLY;
2892a03aff88SGleb Smirnoff 		break;
2893a03aff88SGleb Smirnoff 	default:
2894a03aff88SGleb Smirnoff 		which = RATELIM_OTHER;
2895a03aff88SGleb Smirnoff 		break;
2896a03aff88SGleb Smirnoff 	};
2897a03aff88SGleb Smirnoff 
2898a03aff88SGleb Smirnoff 	pps = counter_ratecheck(&V_icmp6_rates[which], V_icmp6errppslim +
2899a03aff88SGleb Smirnoff 	    V_icmp6lim_curr_jitter);
2900a03aff88SGleb Smirnoff 	if (pps > 0) {
2901a03aff88SGleb Smirnoff 		if (V_icmp6lim_output)
2902a03aff88SGleb Smirnoff 			log(LOG_NOTICE, "Limiting ICMPv6 %s output from %jd "
2903a03aff88SGleb Smirnoff 			    "to %d packets/sec\n", icmp6_rate_descrs[which],
2904a03aff88SGleb Smirnoff 			    (intmax_t )pps, V_icmp6errppslim +
2905a03aff88SGleb Smirnoff 			    V_icmp6lim_curr_jitter);
2906a03aff88SGleb Smirnoff 		icmp6lim_new_jitter();
2907a03aff88SGleb Smirnoff 	}
2908a03aff88SGleb Smirnoff 	if (pps == -1) {
2909c6c96aabSGleb Smirnoff 		ICMP6STAT_INC(icp6s_toofreq);
2910a03aff88SGleb Smirnoff 		return (-1);
291182cd038dSYoshinobu Inoue 	}
291282cd038dSYoshinobu Inoue 
2913a03aff88SGleb Smirnoff 	return (0);
291482cd038dSYoshinobu Inoue }
2915